diff --git a/docs/plans/mission-item-12-peer-directory.md b/docs/plans/mission-item-12-peer-directory.md
new file mode 100644
index 000000000..52048a8e2
--- /dev/null
+++ b/docs/plans/mission-item-12-peer-directory.md
@@ -0,0 +1,112 @@
+# Mission item 12: the weight-backed peer directory, prototype (status log)
+
+Lane: horizon (mission items 4 and 12), 7 October 2026, after item 4's gate line. Branches: `peer-directory` (this repo, on
+master) and `peer-directory-node` (the fork, on release-0.3.20-node dc141409; targets 0.3.21). Times UK (BST) unless marked Z.
+
+The item (mission.md 2.12, invent.md 7.1): a coinbase section where a key above dust may publish its node's address; a fresh
+node dials from that list weighted by 30-day weight, beside the DNS seeds. Gate: a fresh node with genesis peers only reaches 8
+outbound from the directory; a 34 percent attacker eclipses under 0.1 percent of 1,000 fresh starts (simulation is fine); the NAT
+fraction measured on the fleet (owed to the fleet lane, asked 7 October 13:0x UK; nothing rented). Dropped if the NAT fraction
+makes the list useless: this lane reports, it does not decide.
+
+## 1. What exists to build on (read before writing)
+
+| Where | What | Used how |
+|---|---|---|
+| fork `consensus/core/src/finality.rs` `FinalityItem` (tags 1 vote, 2 certificate, 3 evidence, 4 leave), `encode_section` / `decode_section` (`items || len || "IGNF"` at the end of the coinbase payload), `Leave` (W7: `daa || pubkey || signature`, signed by the vote key, carried LAST so a decoder from before its tag stops at it) | the section codec and the item shape to copy | the address item is tag 5 with the same carriage rule: last, after leaves, and only once its switch is on |
+| fork `consensus/src/processes/finality.rs` `ingest_leave` (block-carried, dated by the lowest carrier), `template_candidates` / `section_from` (what a template carries), `leave_active` (switch by DAA), `FinalityState.leaves` (persisted) | the ingest, the carriage and the switch pattern | the directory is a map key hash to (address, carrier DAA), persisted in the state the same way |
+| fork `components/connectionmanager/src/lib.rs` `handle_outbound_connections` | dials from the address manager's prioritised random iterator, then the DNS seeders when connections are still missing | the directory draw goes between the two: addresses drawn by weight from the directory are fed to the address manager and dialled before the seeders are asked |
+| fork `components/addressmanager/src/lib.rs` `add_address`, `iterate_prioritized_random_addresses` (weighted by failure count and prefix bucket) | the store a dialled address lives in | directory addresses enter it like seeder answers; the weight decides which enter, the store's own rule decides the order |
+| fork `consensus/core/src/config/params.rs` `consensus_digest` (a switch at never is outside the digest; set, it is in) | the activation pattern every 0.3.16 switch follows | `peer_directory_activation_daa`, never on every network |
+
+## 2. Design, as built (prototype; fork branch peer-directory-node on release-0.3.20-node dc141409, commits 0cad5106 and db28d331 (tests); repo branch peer-directory on master 819d536b, commits 9a64d18c and 3e0dfa17 (gate), pushed to origin)
+
+| Item | Rule |
+|---|---|
+| Wire | `AddressAnnounce { daa, ip: [u8; 16], port, pubkey, signature }` (core `finality.rs`), 171 B, signed by the vote key the header names under `IGNEUM_ADDR_V1` over `"igneum-addr-v1/" || chain_id || 0 || daa || ip || port` |
+| Carriage | in the MINER's extra data as `IGNP || hex(body)`, the key reveal's form (`IGNA` is already the EVM payout tag), never in the finality section: no switch for carriage, a node without the tag never meets it; `igneum-miner mine --announce <ip:port>` puts one in every template of every identity (`announced`, dated at the sink's DAA score when the run began) |
+| Reading | `FinalityManager::on_block_body` at or above `peer_directory_activation_daa`: the announcement must be by the block's own key, verify, and name a routable-in-form address; one node-local entry per key, the newest carrier wins (not persisted: a restarted node refills it from the blocks it sees; a prototype's gap) |
+| Report | `ConsensusApi::peer_directory()` rows with each key's weight at the latest determined checkpoint (0 under dust); entries older than a weight window dropped on the way |
+| Draw | `ConsensusApi::peer_directory_draw(n, exclude)`: without replacement, proportional to weight, keys under dust never drawn |
+| Dialling | `ConnectionManager::handle_outbound_connections`: after the address store's own iterator and before the DNS seeders, when connections are still missing, 2 x missing addresses from the draw enter the address store and are dialled at once (`DirectoryDraw` closure wired in `protocol/flows/src/service.rs` through the consensus's blocking session) |
+| Switch | `peer_directory_activation_daa`, never on every network (the four network constants), in the digest once set, in `OverrideParams` and the 60x file |
+| Not done | the RPC that lists the directory (the harness reads `getConnectedPeerInfo` and the node log instead); persistence across restarts; Ember and the phone's use of the list (invent.md 7.1's third hour) |
+
+## 3. Gate plan
+
+| Gate | How |
+|---|---|
+| a fresh node with genesis peers only reaches 8 outbound from the directory | fast-time network of 10 listing nodes (each announcing its loopback address) plus one fresh node started with `--outpeers=8`, `--nodnsseed` and one `--addpeer` to a genesis peer that serves blocks only; the fresh node's `getConnectedPeerInfo` shows 8 outbound within 5 min, all from the directory |
+| a 34 percent attacker eclipses under 0.1 percent of 1,000 fresh starts | `sim/peer-directory/eclipse.py`: the draw as implemented (weighted, without replacement, 8 peers) over a table where the attacker's keys hold 34 percent of the weight and list 34 percent of the addresses; 1,000 starts; expected 1.8e-4 at 8 peers (invent.md model E); also 16 peers and the honest-majority-of-peers reading |
+| the NAT fraction | RECEIVED from the fleet lane (ac055d60427caab99) at 13:1x UK, read at 12:06Z from each standing live-devnet node's own log, nothing rented: reachable from outside 2 of 14 (hub-1, RunPod, 26611 mapped: 2,844 inbound peer connections against 86 outbound; pool-1, RunPod, mapped 4463: 1,692 against 99); not reachable 12 of 14 (every Vast box: 0 inbound peer connections each, 96 to 542 outbound, no `--externalip`, no mapped port). So 86 percent of the fleet's nodes sit behind NAT and hold their 4 to 5 peers by dialling out; the two reachable nodes carry every inbound connection. Caveat (theirs): a rented fleet overstates the NAT share for datacentre operators and understates it for home miners; a fair read for "a node started with the defaults". Left out: the four Devnet 2 pods and the Hetzner seed. The marker was "Connected to incoming peer" against "Connected to outgoing peer" (the RPC server's local accepts are not peers). |
+
+## 4. Runs
+
+### The eclipse simulation (`sim/peer-directory/eclipse.py`, box 2, nice 10, 13:5x to 14:0x UK)
+
+The draw as implemented (without replacement, proportional to weight at the latest checkpoint), 200 honest keys with Zipf
+weights, the attacker at 34 percent of the weight split over `m` keys of equal weight, seed 7.
+
+| starts | peers | attacker keys | eclipsed | rate | model E a^n | attacker majority of the peers |
+|---|---|---|---|---|---|---|
+| 1,000 | 8 | 8 | 0 | 0 | 1.79e-4 | 4.0 percent |
+| 1,000 | 8 | 64 | 1 | 1.0e-3 | 1.79e-4 | 9.8 percent |
+| 1,000 | 8 | 1,000 | 0 | 0 | 1.79e-4 | 10.7 percent |
+| 1,000 | 16 | 8, 64, 1,000 | 0, 0, 0 | 0 | 3.19e-8 | 0, 9.2, 9.2 percent |
+| 100,000 | 8 | 8 | 0 | 0 | 1.79e-4 | 4.8 percent |
+| 100,000 | 8 | 64 | 14 | 1.4e-4 | 1.79e-4 | 10.7 percent |
+| 100,000 | 8 | 1,000 | 22 | 2.2e-4 | 1.79e-4 | 11.6 percent |
+
+The gate's line (under 0.1 percent of 1,000 fresh starts) is met at 100,000 starts: 1.4e-4 and 2.2e-4, where 1,000 starts
+cannot resolve it (1 in 1,000 is exactly the line). Two readings beyond model E: with fewer attacker keys than peers an eclipse
+is impossible under the draw without replacement (the dust threshold, 100 blocks a window on mainnet, prices each attacker
+key at 100 blocks), and the attacker holds a MAJORITY of a fresh node's peers in about 11 percent of starts at 8 peers, which
+is the number that matters for a relay-level attack rather than a full eclipse; 16 peers takes that to 9 percent and the
+eclipse to zero in 1,000.
+
+### Unit tests (box 2)
+
+| Test | Result |
+|---|---|
+| core `address_announce_round_trips_and_verifies_under_its_key_only` | 1 of 1 |
+| node `the_peer_directory_lists_a_blocks_own_key_at_its_newest_address_only_when_switched_on` (known-failed first: the switch at never lists nothing) | 1 of 1 |
+| `cargo check -p kaspad -p igneum-miner --features kaspad/igneum-pow` on the branch | ok |
+
+### The fast-time gate (box 2, `tools/fast-time-remote.sh --box 2`, binary of peer-directory-node 0cad5106, 13:27 to 13:34 UK)
+
+`infra/fast-time/peer-directory.mjs`: ten listing nodes at one CPU thread each, every miner announcing its node's loopback
+p2p address, every node advertising an unroutable external ip (10.255.0.0/16) so ordinary address gossip hands a fresh node
+dead addresses only; after 200 s a fresh node starts with `--outpeers=8` and one `--addpeer` to node 0 and is watched 180 s.
+
+| Case | Must | Got | Numbers |
+|---|---|---|---|
+| switch off, expect one (the known-failed case) | PASS | PASS | node 0 logged 0 listings; the fresh node held 1 outbound (node 0) for the whole watch, 0 draw lines, synced 448 blocks |
+| switch off, expect eight (the harness's own failed shape) | FAIL | FAIL | 1 outbound, 0 from the directory |
+| switch on, expect eight (THE GATE LINE) | PASS | PASS | node 0 logged 10 listings; the fresh node reached 8 outbound at 231.7 s (about 30 s after it started), 9 connections from the directory in one draw, synced 414 blocks |
+
+Three harness faults on the way, each fixed: the log directory missing on the box (every case died at the redirect); the
+peer count read `isOutbound` where the fork's `RpcPeerInfo` is `is_outbound`; and the wrapper's first run checking the
+worktree root out on the box (fixed on horizon, 10140f9f, carried here).
+
+## 5. Verdict line for main
+
+The prototype does what invent.md 7.1 asked, on the numbers: a fresh node with one genesis peer and dead gossip reached 8
+outbound from the directory in about 30 s; the eclipse by a 34 percent attacker is 1.4e-4 to 2.2e-4 at 8 peers over 100,000
+starts (under the 0.1 percent line; 0 with 8 or fewer attacker keys, since the draw is without replacement), and the attacker
+holds a majority of a fresh node's peers in about 11 percent of starts, which is the number to watch. The NAT reading (2 of 14
+standing nodes reachable, 86 percent behind NAT with no inbound path) makes the list a SEED SUPPLEMENT, not a replacement:
+today it would list the two reachable fleet nodes beside the seeds, and a home miner's node (the 12-of-14 class unless the app
+maps a port) is a reader of the list, never a listing. Per tier: a home miner's node gains weight-backed peers beside the seeds
+at no cost and lists nothing by default; a rig or a pool node with a mapped port opts in with `--announce` and 171 bytes a block;
+the phone and Ember verify mode are not wired (not done). Listed as useful or dropped is main's and the project lead's call; this lane's
+reading is "keep as a seed supplement behind its switch", which costs 1.7 MB a day per node at 10,000 listing keys (approximate,
+from the item size) and nothing while the switch is never.
+
+Open: an RPC that lists the directory; persistence across restarts; Ember and the phone; the testnet object and every network
+file carry no `peer_directory` field (the switch stays never until a cut sets it).
+
+## 6. Rebase for 0.3.21 (14:0x UK, the shipper's order)
+
+peer-directory-node rebased onto release-0.3.20-node c4459193 in one round, no conflict: tip 2e32d5f6, on both box mirrors under its name. Suite on build-2 at 2e32d5f6: igneum-miner 19 of 19, connectionmanager 0 tests, consensus lib 116 of 117 (the ban flake only; cargo stopped before consensus-core's target). Digest on tools/fleet/override.json: 7bd98cc4..., the same as the pin's binary. Handed to the node lane a283f5f0d364ceef0.
+
+Digest on the file hub-1 runs (/root/fleet/override.json, sixteen fields, the copy at /tmp/igneum-devnet/override-v3-live.json on build-1): eada4bda8aa8368c2b2c3d17744bc7a70a0ff0e996dad681884d3ac5de1207eb, the shipper's string, read 14:1x UK from the branch binary on build-2; 7bd98cc4 was master's tools/fleet/override.json, another file. The live digest is unchanged by this branch.
diff --git a/docs/plans/mission-item-4-fork-gate.md b/docs/plans/mission-item-4-fork-gate.md
new file mode 100644
index 000000000..c8bf763ab
--- /dev/null
+++ b/docs/plans/mission-item-4-fork-gate.md
@@ -0,0 +1,142 @@
+# Mission item 4: weight-gated deep fork choice, the gate (status log)
+
+Lane: horizon (mission items 4 and 12), started 7 October 2026, 12:41 UK, on main's brief. Branches: `horizon` (this repo, on master
+d1285cef) and `horizon-node` (the fork, on release-0.3.20-node dc141409, the 0.3.20 line; this work targets 0.3.21). Worktrees
+`igneum-wt-horizon` and `igneum-wt-horizon/vendor/igneum-node-horizon`. Times are UK (BST) unless marked Z.
+
+The item (mission.md 2.4): a tip whose fork point is older than D (10 min of past-median time) is a fork-choice candidate only
+if the keys that built it hold at least a third of the weight table at the fork point. Gate, fast time: a 51 percent fresh-key
+fork from 15 min back is refused by every honest node; a one-third-weight fork is accepted; partition heal unchanged. Known-failed
+cases first.
+
+## 1. What already existed (read before writing anything)
+
+| Where | What | State |
+|---|---|---|
+| fork `consensus/src/processes/finality.rs` `deep_fork_refusal`, asked by `sink_search_algorithm` for every popped candidate | the rule, behind `fork_gate_activation_daa` (never on every network; in the digest once set) with `fork_gate_window_daa` 600 s; the fork point is the highest chain ancestor of the candidate on the sink's chain; depth = the larger of sink minus fork and candidate minus fork; builders = the vote keys of every block of the candidate's chain since the fork (chain blocks and mergesets); the table = `voters_at(fork)`; refused under `3 x weight < total`; node-local memo per refused block | on the 0.3.20 line since 61b22057 (6 October), fixes 3301cf32 (depth along both chains) and aa0182aa (no extension shortcut) |
+| fork unit tests | `without_the_fork_gate_a_minor_keys_deep_fork_wins` (known-failed), `the_fork_gate_refuses_a_deep_fork_under_a_third_and_passes_the_rest` (25 percent refused, 75 percent passes, inside the window passes) | green on that line |
+| `infra/fast-time/fork-gate.mjs` on branch ca3-v4-node (never on master) | a TWO-node harness: A at 75 percent, B at 25 percent, A IDLE through the split; cases gate-on hold (PASS 23:45Z 6 Oct), gate-off reorg (PASS), gate-off hold (FAIL as it must); run on the Mac; a `pkill -f` on the devnet suffix | the record in `docs/plans/counter-asic-3-node.md` 7.5 |
+| the live devnet and Devnet 2 override files, the testnet object | no `fork_gate` field anywhere: the switch is never on every network | unchanged by this lane |
+
+What the mission gate asks beyond that record: a FRESH key (0 of the table, not 25 percent), the honest side MINING through the
+split (the record idled it), EVERY honest node (two, not one), the one-third case accepted, and the partition heal shown unchanged
+with the gate on and off. Nothing in the rule needed to change for any of these; this lane adds the proof.
+
+## 2. What this lane added
+
+| Piece | Where | What |
+|---|---|---|
+| Fresh-key unit test | fork `a_fresh_keys_deep_fork_wins_only_with_the_gate_off` | known-failed first: at never a key with no block in the table wins by blue work; at 0 it is refused with weight 0 of the table |
+| One-third line unit test | fork `the_gate_passes_at_one_third_of_the_table_and_refuses_under_it` | eight (honest mix, fork height) pairs; each outcome equals `3 x weight >= total` read from the table the gate reads; both sides seen |
+| Three-node harness | `infra/fast-time/fork-gate.mjs` (new on master's line) | H1 and H2 honest and mining through every phase, B the third node; modes attack (B fresh, 3 of 5 threads), third (B at about half of the table), partition (H1 against H2); a reorg is read from the chain (`getVirtualChainFromBlock` of the pre-cut tip lists removed blocks), never from a key; blue work compared as BigInt; leftovers stopped by pid file |
+| The six-case runner | `infra/fast-time/fork-gate-gate.mjs` | known-failed cases first, then the gate line, the one-third case, the two partition heals; GREEN only when every case gives the verdict it must and the two heals agree |
+| Box wrapper | `tools/fast-time-remote.sh` (whole-body block; listed in `tools/ci/whole-body-check.sh`) | runs a harness on a box under a slot with a holder line and a JSONL row, the node binaries from a fork worktree's target on the box, results fetched back |
+
+## 2a. The hole the known-failed cases found (13:1x to 13:3x UK)
+
+The one-third unit test failed on box 2 at its second pair: B on every fourth block, fork at height 50, B holding 12 of 49 at
+the fork, and the private tip WON. A probe test (temporary, since removed) read the gate's own answer at fork heights 40, 45,
+48, 50, 55, 60 and 65: refused at 40, 48 and 60; let through at 45, 50 and 55 (65 is inside the window, a legitimate pass).
+The let-through rows read "keys 2, signed 44 of 44": the honest key A was in the attacker's builders. The pattern is the fork
+block's own key: heights that are multiples of 4 sit on B's blocks and were refused; the others sit on A's blocks and passed.
+
+Cause: `collect_builders` took each chain block's mergeset (blues and reds) and GHOSTDAG's `mergeset_blues[0]` is the block's
+selected parent, so the first private block above the fork carried the FORK block into the builders, and the fork block was
+A's. A 25 percent key forking right after a 75 percent key's block walked through the gate with A's weight on its side. The
+same reading let a private chain that merges honest blocks as side parents inherit every merged key. The 6 October harness
+PASS (23:45Z) was luck: its pre-cut sink was B-built, so the leaked key was B's own.
+
+Fix (fork, `collect_builders(block, sink, keys)`): a builder is the key of a block the sink does NOT have (not a DAG ancestor
+of the sink, the sink itself included). The fork block is the sink's; honest blocks the attacker merged are the sink's; a
+partition side's own blocks are not, so a heal is unchanged. New unit test, known-failed shape first:
+`a_deep_fork_counts_only_the_blocks_the_sink_lacks_as_builders` (B from A's block at 45 refused; a private chain merging
+honest blocks 46 to 80 wins at never and is refused at 0).
+
+Also seen: `ban_is_decided_by_the_carrying_block_so_nodes_agree_on_every_voter_list` died with `UnexpectedDifficulty` in the
+full crate run (box 2 under load 65) and passed alone (1 of 1, 13:1x UK); not this lane's change, noted for the suite count.
+
+## 3. Runs
+
+### Commits
+
+| Repo | Branch | Commit | What |
+|---|---|---|---|
+| fork | horizon-node (on release-0.3.20-node dc141409) | eb32d2e0 | the builders fix (`collect_builders` skips every block the sink has) and the fork-gate tests on the two-instance lab |
+| fork | horizon-node | a6a71ac2 | the lab inserts into the judge first and rebuilds a block refused on `UnexpectedDifficulty` (the suite's flake class) |
+| repo | horizon (on master d1285cef) | 0dc2adff | the three-node harness, the six-case runner, the box wrapper, the whole-body check row |
+
+### Suites (box 2, igneum-build-2, nice 10 on 32 cores)
+
+| Run (UK) | Command | Result |
+|---|---|---|
+| 12:5x | `-- test --release -p kaspa-consensus` (the first test version, no fix) | 111 of 113: my one-third test FAIL (the hole), `ban_is_decided_by_the_carrying_block...` FAIL on `UnexpectedDifficulty` (load 65; passes alone 13:1x, 1 of 1) |
+| 13:2x | `-- test --release -p kaspa-consensus --lib processes::finality::tests` (the fix, the lab) | 24 of 24 |
+| 13:3x | `-- test --release -p kaspa-consensus` (eb32d2e0 content) | 112 of 114: two lab tests FAIL on `UnexpectedDifficulty` (the same flake class, now reachable by the lab's second instance) |
+| 13:3x | `-- test --release -p kaspa-consensus` at a6a71ac2, 0dcaf4c5, ca7acb99 (the lab's rebuild, a pause between rebuilds, salted hashes) | 111 or 112 of 114 each: the two labs whose instances share one config still FAIL at block 61 under load; the probes showed `UnexpectedDifficulty` thirty times over 7.5 s, so neither clock nor hash memo |
+| 13:38 | `-- test --release -p kaspa-consensus` at 6eb21fc9 (the lab on `DifficultyRule::KaspaSampled`, DAG-only bits) | 113 of 114 in the lib target, 3 ignored; the one FAIL is the pre-existing `ban_is_decided_by_the_carrying_block_so_nodes_agree_on_every_voter_list` (the same class: the dual rule's template bits and header stamp disagree at block 61, the first retarget, under load; passes alone). The lib target failing stops cargo before the integration targets. |
+
+Fork commits after eb32d2e0, test-only: a6a71ac2, 0dcaf4c5, ca7acb99, f225ed9f, 6eb21fc9 (the lab inserts into the judge first and rebuilds on the flake; a pause between rebuilds; every lab its own hash words; the DAG-only difficulty rule; the import). The binary content of kaspad and igneum-miner is the same from eb32d2e0 on; the gate binary carries 6eb21fc9.
+
+### Build (box 1, igneum-build-1)
+
+| Run (UK) | Command | Result |
+|---|---|---|
+| (pending) | `tools/build-remote.sh --no-fetch -- build --release -p kaspad -p igneum-miner --features kaspad/igneum-pow` from the fork worktree at a6a71ac2 (igneum-pow at 8c728ca3 through an untracked paths override to `igneum-pow-amend`, the 0.3.20 pairing); two earlier submissions of the uncommitted tree were stopped by pid so the gate binary carries the commit | |
+
+### Tree checks (the Mac, checks only)
+
+`tools/ci/pre-push.sh --ci` on horizon 0dc2adff: GREEN, 43 checks in 31 s (13:3x UK).
+
+### The gate (box 2, igneum-build-2, by main's word at 13:4x UK: box 1's slots stay with the 0.3.20 pin)
+
+Binary: `igneumd` and `igneum-miner` of horizon-node 6eb21fc9 (igneum-pow 8c728ca3), built on box 2 at 13:5x UK
+(`tools/build-remote.sh --box 2`, 113 s); run through `tools/fast-time-remote.sh --box 2` (one slot, the bounded class, 583 s
+for the six cases side by side), case summaries and logs in `docs/plans/mission-item-4-gate/`. Window 60 DAA, joint 240 s,
+split 180 s, watch 150 s; honest nodes H1 and H2 at one CPU thread each through every phase; the attacker at 3 threads in
+the split (60 percent of the CPU hash: the refusal reads weight, not how much heavier the chain is).
+
+| Case | Must | Got | Side 2 at the fork | Fork depth (DAA) | Blue work at the heal, side 2 against H1 | Honest nodes after the heal |
+|---|---|---|---|---|---|---|
+| attack, gate off, expect reorg (the rule's known-failed case) | PASS | PASS | 0 bps (fresh key) | 191 | 17,470,131 against 14,893,198 | H1 and H2 reorged at 510 s, 0 refusal lines |
+| attack, gate off, expect hold (the harness's own failed shape) | FAIL | FAIL | 0 bps | 179 | 19,683,187 against 17,459,678 | H1 and H2 reorged at 480 s, 0 refusal lines |
+| attack, gate on, expect hold (THE GATE LINE) | PASS | PASS | 0 bps | 197 | 20,297,242 against 14,807,915 | H1 and H2 HELD for the whole watch, 177 refusal lines each, both know side 2's tip; side 2 kept its chain |
+| third, gate on, expect reorg (a one-third-weight fork accepted) | PASS | PASS | 6,000 bps | 166 | 28,969,222 against 24,628,833 | H1 and H2 reorged at 477 s, 0 refusal lines |
+| partition, gate on, expect reorg | PASS | PASS | 3,719 bps | 194 | 18,089,683 against 11,490,863 | H1 reorged at 507 s, 0 refusal lines; H2 kept its chain |
+| partition, gate off, expect reorg (the same outcome) | PASS | PASS | 5,583 bps | 191 | 19,576,159 against 12,270,631 | H1 reorged at 507 s, 0 refusal lines; H2 kept its chain |
+
+GATE GREEN, 13:58 UK: 6 of 6 cases gave the verdict they must; the partition heal is the same with the gate on and off
+(both reorg H1 onto the heavier side, 0 refusals). Reading "15 min back" at fast time: the devnet window is 600 s and the
+mission's 15 min is one and a half windows; the harness keeps the window at 60 DAA and the split at 180 s, three windows
+deep, so the refusal was asked from 61 s of the split on and held for its whole second half.
+
+## 4. Consequences per tier
+
+One sentence: with the fix, a renter's or a chain-splitter's deep reorg is bounded by weight for every tier alike, and an
+honest key's own blocks are never refused.
+
+| Tier | What the number means |
+|---|---|
+| Home miner (one card, any size, Windows, Linux or macOS, any vendor) | its node refuses the same tips a rig's or a pool's node refuses; a fresh-key chain from more than ten minutes back never becomes its sink while the key that built it holds under a third of the window; nothing to configure, nothing to pay; the memo costs one mergeset per refused block |
+| Rig | the same; a rig's own blocks after a connectivity gap are built by its own keys and pass on share |
+| Pool user | the pool's node holds the chain the pool mined; a renter cannot reorganise the pool's payouts past ten minutes without a third of the weight |
+| Exchange and holder | a 12-hour double spend during a pause or in the first month (51-percent.md section 5 rank 2, USD 146 at 1 GH/s) is gone: the deep fork is refused at every honest node, lock or no lock |
+| The rule's cost | none for certificates; a partition side under a third cannot reorg the other past the window (the intended outcome, unchanged by the fix) |
+
+Before the fix the bound held only when the fork sat on a block of a small key; a renter forking right after a large
+miner's block, or merging honest blocks into its chain, walked through on every tier.
+
+## 5. Open
+
+| Item | Owner |
+|---|---|
+| Merge: horizon-node is on release-0.3.20-node dc141409; main's word is to rebase onto the 0.3.20 pin once named (c4459193 the candidate) for 0.3.21; never a push to a release branch | this lane, when main names the pin |
+| The difficulty red: `ban_is_decided_by_the_carrying_block...` and, before the lab moved to the DAG-only rule, two lab tests, on `UnexpectedDifficulty` at block 61 (the first retarget) under the full suite's load; the dual rule's template bits come from a virtual resolved at one instant and the header is stamped at a later one | the node lane for 0.3.21 (main's word: logged, not fixed here) |
+| The fork's test block builder asks the gate (it runs the sink search from the parents it is given): any future test that builds a private chain on a gated instance builds it on the fork block instead; the lab's two-instance shape is the pattern | the node lane; a note in `consensus/src/consensus/test_consensus.rs` is owed |
+| `tools/box` named in the brief does not exist; the box tooling is `tools/build-remote.sh` on `infra/build-server/lib.sh`, which `tools/fast-time-remote.sh` uses; the wrapper's first run checked the worktree root out on box 2 and took the fork sources with it (fixed the same hour: overlay only, 10140f9f) | main's reading |
+| The devnet, Devnet 2 and the testnet object carry no `fork_gate` field: the switch stays never everywhere until a cut sets it (in the digest once set) | the shipper and the project lead |
+
+## 6. Rebase for 0.3.21 (14:0x UK, the shipper's order)
+
+horizon-node rebased onto release-0.3.20-node c4459193 (the 0.3.20 pin) in one round, no conflict: tip 437f0438, on both box mirrors under its name. Suite on build-2 at 437f0438: `-p kaspa-consensus` lib 117 of 119, 3 ignored (the ban difficulty flake and `a_chain_that_misses_an_adopted_lock_never_locks_here`, which passes alone 1 of 1 and passed in every earlier full run; load 113). Digest on tools/fleet/override.json (origin/master): 7bd98cc4..., the same as the pin's own binary on that file. Handed to the node lane a283f5f0d364ceef0 for the 0.3.21 merge after 55768f88, miner-reliability-20 and pool-finish-node.
+
+Digest on the file hub-1 runs (/root/fleet/override.json, sixteen fields, the copy at /tmp/igneum-devnet/override-v3-live.json on build-1): eada4bda8aa8368c2b2c3d17744bc7a70a0ff0e996dad681884d3ac5de1207eb, the shipper's string, read 14:1x UK from the branch binary on build-2; 7bd98cc4 was master's tools/fleet/override.json, another file. The live digest is unchanged by this branch.
diff --git a/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-hold.json b/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-hold.json
new file mode 100644
index 000000000..b7604565e
--- /dev/null
+++ b/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-hold.json
@@ -0,0 +1,933 @@
+{
+  "pass": false,
+  "expect": "hold",
+  "case": "attack-gate-off-expect-hold",
+  "mode": "attack",
+  "gate": "off",
+  "window": 60,
+  "joint": 240,
+  "split": 180,
+  "watch": 150,
+  "threads": {
+    "honest_each": 1,
+    "attacker_split": 3,
+    "attacker_joint": 0
+  },
+  "keys": {
+    "h1": "8da9ddee…",
+    "h2": "eda9cde4…",
+    "side2": "0e2c6fe2…"
+  },
+  "share_at_fork": {
+    "side2": 0,
+    "others": 120,
+    "side2_bps": 0
+  },
+  "fork_daa": 247,
+  "fork_depth_daa_at_heal": 179,
+  "sinks": {
+    "joint": {
+      "h1": {
+        "hash": "0535d8ae67287238ee528bae5ab1f366273bd1c65c6a94342ec3879a40b81c88",
+        "blocks": 248,
+        "daa": 247,
+        "blue": 248,
+        "blueWork": "11209205",
+        "key": "8da9ddee…"
+      },
+      "h2": {
+        "hash": "0535d8ae67287238ee528bae5ab1f366273bd1c65c6a94342ec3879a40b81c88",
+        "blocks": 248,
+        "daa": 247,
+        "blue": 248,
+        "blueWork": "11209205",
+        "key": "8da9ddee…"
+      },
+      "side2": {
+        "hash": "0535d8ae67287238ee528bae5ab1f366273bd1c65c6a94342ec3879a40b81c88",
+        "blocks": 248,
+        "daa": 247,
+        "blue": 248,
+        "blueWork": "11209205",
+        "key": "8da9ddee…"
+      }
+    },
+    "split": {
+      "h1": {
+        "hash": "d5347d2cd3468901fda8e5a1caffe0be55d45eb12739577fadb0141d2291c2ba",
+        "blocks": 412,
+        "daa": 411,
+        "blue": 412,
+        "blueWork": "17459678",
+        "key": "8da9ddee…"
+      },
+      "h2": {
+        "hash": "d5347d2cd3468901fda8e5a1caffe0be55d45eb12739577fadb0141d2291c2ba",
+        "blocks": 412,
+        "daa": 411,
+        "blue": 412,
+        "blueWork": "17459678",
+        "key": "8da9ddee…"
+      },
+      "side2": {
+        "hash": "bfdb75e384417228a85f4098f8f2bb65d40c271ce674bea2d1cc8a3c6c335f53",
+        "blocks": 427,
+        "daa": 426,
+        "blue": 427,
+        "blueWork": "19683187",
+        "key": "0e2c6fe2…"
+      }
+    }
+  },
+  "per_node": {
+    "h1": {
+      "held": false,
+      "reorged": true,
+      "reorg_at_s": 480.3,
+      "knows_side2_tip": true,
+      "refusal_lines": 0
+    },
+    "h2": {
+      "held": false,
+      "reorged": true,
+      "reorg_at_s": 480.3,
+      "knows_side2_tip": true,
+      "refusal_lines": 0
+    }
+  },
+  "checks": {
+    "side2_under_a_third_at_fork": true,
+    "fork_deeper_than_window": true,
+    "side2_heavier_at_heal": true,
+    "every_honest_node_learned_side2_chain": true,
+    "every_honest_node_held": false,
+    "every_honest_node_reorged": true,
+    "every_honest_node_logged_a_refusal": false,
+    "no_honest_node_logged_a_refusal": true,
+    "side2_kept_its_chain": true
+  },
+  "failed_checks": [
+    "every_honest_node_held",
+    "every_honest_node_logged_a_refusal"
+  ],
+  "refusal_example": null,
+  "samples": [
+    {
+      "t": 425.2,
+      "h1": {
+        "blocks": 416,
+        "sink": "7b85c0879ec1a3f0",
+        "daa": 414,
+        "blue": 415,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 416,
+        "sink": "7b85c0879ec1a3f0",
+        "daa": 414,
+        "blue": 415,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 435,
+        "sink": "8bb7e69cea95ecaa",
+        "blue": 435,
+        "reorged": false
+      }
+    },
+    {
+      "t": 430.2,
+      "h1": {
+        "blocks": 423,
+        "sink": "44ee221996bf6519",
+        "daa": 422,
+        "blue": 423,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 423,
+        "sink": "44ee221996bf6519",
+        "daa": 422,
+        "blue": 423,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 441,
+        "sink": "46ee56ca78abcfa4",
+        "blue": 441,
+        "reorged": false
+      }
+    },
+    {
+      "t": 435.2,
+      "h1": {
+        "blocks": 430,
+        "sink": "fe81d0b598b34760",
+        "daa": 429,
+        "blue": 430,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 430,
+        "sink": "fe81d0b598b34760",
+        "daa": 429,
+        "blue": 430,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 445,
+        "sink": "bf71c714df908384",
+        "blue": 445,
+        "reorged": false
+      }
+    },
+    {
+      "t": 440.2,
+      "h1": {
+        "blocks": 440,
+        "sink": "acab21ca95900afc",
+        "daa": 439,
+        "blue": 440,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 440,
+        "sink": "acab21ca95900afc",
+        "daa": 439,
+        "blue": 440,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 448,
+        "sink": "b8fccb90e479e8a5",
+        "blue": 448,
+        "reorged": false
+      }
+    },
+    {
+      "t": 445.3,
+      "h1": {
+        "blocks": 443,
+        "sink": "d9051d6139ae8afa",
+        "daa": 442,
+        "blue": 443,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 443,
+        "sink": "d9051d6139ae8afa",
+        "daa": 442,
+        "blue": 443,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 456,
+        "sink": "2cc48c7a2084d5e4",
+        "blue": 456,
+        "reorged": false
+      }
+    },
+    {
+      "t": 450.3,
+      "h1": {
+        "blocks": 450,
+        "sink": "cea4dc9c673bd13a",
+        "daa": 449,
+        "blue": 450,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 450,
+        "sink": "cea4dc9c673bd13a",
+        "daa": 449,
+        "blue": 450,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 466,
+        "sink": "4f46263c45d1d32a",
+        "blue": 466,
+        "reorged": false
+      }
+    },
+    {
+      "t": 455.3,
+      "h1": {
+        "blocks": 452,
+        "sink": "1a8679962a368c21",
+        "daa": 451,
+        "blue": 452,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 452,
+        "sink": "1a8679962a368c21",
+        "daa": 451,
+        "blue": 452,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 472,
+        "sink": "12dcc825edc2fa17",
+        "blue": 472,
+        "reorged": false
+      }
+    },
+    {
+      "t": 460.3,
+      "h1": {
+        "blocks": 454,
+        "sink": "2a7c0240cfe56042",
+        "daa": 453,
+        "blue": 454,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 454,
+        "sink": "2a7c0240cfe56042",
+        "daa": 453,
+        "blue": 454,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 480,
+        "sink": "bbb6cf12cfd7419f",
+        "blue": 480,
+        "reorged": false
+      }
+    },
+    {
+      "t": 465.3,
+      "h1": {
+        "blocks": 454,
+        "sink": "2a7c0240cfe56042",
+        "daa": 453,
+        "blue": 454,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 454,
+        "sink": "2a7c0240cfe56042",
+        "daa": 453,
+        "blue": 454,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 488,
+        "sink": "f443140c40db1ff4",
+        "blue": 488,
+        "reorged": false
+      }
+    },
+    {
+      "t": 470.3,
+      "h1": {
+        "blocks": 456,
+        "sink": "2c2bf05b3992cb6b",
+        "daa": 455,
+        "blue": 456,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 456,
+        "sink": "2c2bf05b3992cb6b",
+        "daa": 455,
+        "blue": 456,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 493,
+        "sink": "0dd0e90fa5bb4330",
+        "blue": 493,
+        "reorged": false
+      }
+    },
+    {
+      "t": 475.3,
+      "h1": {
+        "blocks": 458,
+        "sink": "cde3915508aeb008",
+        "daa": 457,
+        "blue": 458,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 458,
+        "sink": "cde3915508aeb008",
+        "daa": 457,
+        "blue": 458,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 496,
+        "sink": "7adc2714fa7a10c9",
+        "blue": 496,
+        "reorged": false
+      }
+    },
+    {
+      "t": 480.3,
+      "h1": {
+        "blocks": 505,
+        "sink": "f08f99c6711510d7",
+        "daa": 504,
+        "blue": 505,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 505,
+        "sink": "f08f99c6711510d7",
+        "daa": 504,
+        "blue": 505,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 505,
+        "sink": "f08f99c6711510d7",
+        "blue": 505,
+        "reorged": false
+      }
+    },
+    {
+      "t": 485.3,
+      "h1": {
+        "blocks": 509,
+        "sink": "9dfb826d38e1f6a4",
+        "daa": 508,
+        "blue": 509,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 509,
+        "sink": "9dfb826d38e1f6a4",
+        "daa": 508,
+        "blue": 509,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 509,
+        "sink": "9dfb826d38e1f6a4",
+        "blue": 509,
+        "reorged": false
+      }
+    },
+    {
+      "t": 490.4,
+      "h1": {
+        "blocks": 511,
+        "sink": "a9bdeeb2148190f1",
+        "daa": 510,
+        "blue": 511,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 511,
+        "sink": "a9bdeeb2148190f1",
+        "daa": 510,
+        "blue": 511,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 511,
+        "sink": "a9bdeeb2148190f1",
+        "blue": 511,
+        "reorged": false
+      }
+    },
+    {
+      "t": 495.4,
+      "h1": {
+        "blocks": 522,
+        "sink": "fa5aefefc31e1c4c",
+        "daa": 521,
+        "blue": 522,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 522,
+        "sink": "fa5aefefc31e1c4c",
+        "daa": 521,
+        "blue": 522,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 522,
+        "sink": "fa5aefefc31e1c4c",
+        "blue": 522,
+        "reorged": false
+      }
+    },
+    {
+      "t": 500.4,
+      "h1": {
+        "blocks": 525,
+        "sink": "3f659b8355cf6fb8",
+        "daa": 524,
+        "blue": 525,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 525,
+        "sink": "3f659b8355cf6fb8",
+        "daa": 524,
+        "blue": 525,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 525,
+        "sink": "3f659b8355cf6fb8",
+        "blue": 525,
+        "reorged": false
+      }
+    },
+    {
+      "t": 505.4,
+      "h1": {
+        "blocks": 528,
+        "sink": "2b00a2431aecf64d",
+        "daa": 527,
+        "blue": 528,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 528,
+        "sink": "2b00a2431aecf64d",
+        "daa": 527,
+        "blue": 528,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 528,
+        "sink": "2b00a2431aecf64d",
+        "blue": 528,
+        "reorged": false
+      }
+    },
+    {
+      "t": 510.4,
+      "h1": {
+        "blocks": 534,
+        "sink": "f10f202f1b8adf79",
+        "daa": 533,
+        "blue": 534,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 534,
+        "sink": "f10f202f1b8adf79",
+        "daa": 533,
+        "blue": 534,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 534,
+        "sink": "f10f202f1b8adf79",
+        "blue": 534,
+        "reorged": false
+      }
+    },
+    {
+      "t": 515.4,
+      "h1": {
+        "blocks": 541,
+        "sink": "d70cd34944d6d565",
+        "daa": 540,
+        "blue": 541,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 541,
+        "sink": "d70cd34944d6d565",
+        "daa": 540,
+        "blue": 541,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 541,
+        "sink": "d70cd34944d6d565",
+        "blue": 541,
+        "reorged": false
+      }
+    },
+    {
+      "t": 520.4,
+      "h1": {
+        "blocks": 546,
+        "sink": "35d62b928d603bac",
+        "daa": 545,
+        "blue": 546,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 546,
+        "sink": "35d62b928d603bac",
+        "daa": 545,
+        "blue": 546,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 546,
+        "sink": "35d62b928d603bac",
+        "blue": 546,
+        "reorged": false
+      }
+    },
+    {
+      "t": 525.4,
+      "h1": {
+        "blocks": 552,
+        "sink": "11ee723145434436",
+        "daa": 551,
+        "blue": 552,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 552,
+        "sink": "11ee723145434436",
+        "daa": 551,
+        "blue": 552,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 552,
+        "sink": "11ee723145434436",
+        "blue": 552,
+        "reorged": false
+      }
+    },
+    {
+      "t": 530.4,
+      "h1": {
+        "blocks": 561,
+        "sink": "096fe4e02ba023a4",
+        "daa": 560,
+        "blue": 561,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 561,
+        "sink": "096fe4e02ba023a4",
+        "daa": 560,
+        "blue": 561,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 561,
+        "sink": "096fe4e02ba023a4",
+        "blue": 561,
+        "reorged": false
+      }
+    },
+    {
+      "t": 535.4,
+      "h1": {
+        "blocks": 566,
+        "sink": "58b6d24c4920da55",
+        "daa": 565,
+        "blue": 566,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 566,
+        "sink": "58b6d24c4920da55",
+        "daa": 565,
+        "blue": 566,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 566,
+        "sink": "58b6d24c4920da55",
+        "blue": 566,
+        "reorged": false
+      }
+    },
+    {
+      "t": 540.4,
+      "h1": {
+        "blocks": 567,
+        "sink": "3a757d2721963b97",
+        "daa": 566,
+        "blue": 567,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 567,
+        "sink": "3a757d2721963b97",
+        "daa": 566,
+        "blue": 567,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 567,
+        "sink": "3a757d2721963b97",
+        "blue": 567,
+        "reorged": false
+      }
+    },
+    {
+      "t": 545.4,
+      "h1": {
+        "blocks": 572,
+        "sink": "40cb1b5ff6ffa6e2",
+        "daa": 571,
+        "blue": 572,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 572,
+        "sink": "40cb1b5ff6ffa6e2",
+        "daa": 571,
+        "blue": 572,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 572,
+        "sink": "40cb1b5ff6ffa6e2",
+        "blue": 572,
+        "reorged": false
+      }
+    },
+    {
+      "t": 550.4,
+      "h1": {
+        "blocks": 577,
+        "sink": "e3f1416a5521d05a",
+        "daa": 576,
+        "blue": 577,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 577,
+        "sink": "e3f1416a5521d05a",
+        "daa": 576,
+        "blue": 577,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 577,
+        "sink": "e3f1416a5521d05a",
+        "blue": 577,
+        "reorged": false
+      }
+    },
+    {
+      "t": 555.5,
+      "h1": {
+        "blocks": 584,
+        "sink": "38b6a8056ad74b9d",
+        "daa": 583,
+        "blue": 584,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 584,
+        "sink": "38b6a8056ad74b9d",
+        "daa": 583,
+        "blue": 584,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 584,
+        "sink": "38b6a8056ad74b9d",
+        "blue": 584,
+        "reorged": false
+      }
+    },
+    {
+      "t": 560.5,
+      "h1": {
+        "blocks": 589,
+        "sink": "69c3e39a47332124",
+        "daa": 588,
+        "blue": 589,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 589,
+        "sink": "69c3e39a47332124",
+        "daa": 588,
+        "blue": 589,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 589,
+        "sink": "69c3e39a47332124",
+        "blue": 589,
+        "reorged": false
+      }
+    },
+    {
+      "t": 565.5,
+      "h1": {
+        "blocks": 592,
+        "sink": "6fe943b09aa71ffa",
+        "daa": 591,
+        "blue": 592,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 592,
+        "sink": "6fe943b09aa71ffa",
+        "daa": 591,
+        "blue": 592,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 592,
+        "sink": "6fe943b09aa71ffa",
+        "blue": 592,
+        "reorged": false
+      }
+    },
+    {
+      "t": 570.5,
+      "h1": {
+        "blocks": 595,
+        "sink": "b5217027de64f1a2",
+        "daa": 594,
+        "blue": 595,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 595,
+        "sink": "b5217027de64f1a2",
+        "daa": 594,
+        "blue": 595,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 595,
+        "sink": "b5217027de64f1a2",
+        "blue": 595,
+        "reorged": false
+      }
+    }
+  ],
+  "node": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneumd",
+  "miner": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneum-miner",
+  "slot": 1,
+  "ports": {
+    "base": 30730,
+    "suffix": 981
+  }
+}
diff --git a/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-hold.log b/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-hold.log
new file mode 100644
index 000000000..4890bb9ca
--- /dev/null
+++ b/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-hold.log
@@ -0,0 +1,18 @@
+12:48:26.701 fg1 case attack-gate-off-expect-hold: mode attack, gate off (window 60 DAA), joint 240 s, split 180 s, watch 150 s, honest 1 thread(s) each, attacker 3 (joint 0), expect hold
+12:48:28.281 fg1 h1 up pid 480222 json 30732 p2p 30731
+12:48:29.791 fg1 h2 up pid 481550 json 30742 p2p 30741 addpeer 30731
+12:48:31.307 fg1 b up pid 482808 json 30752 p2p 30751 addpeer 30761,30762
+12:52:34.325 fg1 phase 1 done at 240.0 s: H1 248 blocks sink 0535d8ae daa 247; H2 248 sink 0535d8ae; side 2 (b) 248 sink 0535d8ae; keys H1 8da9ddee H2 eda9cde4 side2 fresh (none yet)
+12:52:34.384 fg1 weight at the fork (last 120 blue blocks of H1's chain): side 2 0, others 120, side 2 0 bps
+12:52:34.387 fg1 links cut at 240.1 s; side 2 (b) now mines with 3 thread(s), the honest side with 1 each
+12:55:34.491 fg1 phase 2 done at 420.2 s: H1 412 blocks sink d5347d2c daa 411 blue 412 work 17459678; side 2 427 sink bfdb75e3 daa 426 blue 427 work 19683187 (side 2 heavier: true); fork depth 179 DAA against window 60
+12:55:34.491 fg1 links restored at 420.2 s; watching H1 and H2 for 150 s
+12:56:04.581 fg1 t=450.3 s H1 450 blocks sink cea4dc9c held; H2 450 blocks sink cea4dc9c held; side 2 466 blocks sink 4f46263c
+12:56:34.656 fg1 H1 left its pre-cut chain at 480.3 s: sink f08f99c6711510d7 by 0e2c6fe2
+12:56:34.659 fg1 H2 left its pre-cut chain at 480.3 s: sink f08f99c6711510d7 by 0e2c6fe2
+12:56:34.661 fg1 t=480.3 s H1 505 blocks sink f08f99c6 REORGED; H2 505 blocks sink f08f99c6 REORGED; side 2 505 blocks sink f08f99c6
+12:57:04.702 fg1 t=510.4 s H1 534 blocks sink f10f202f REORGED; H2 534 blocks sink f10f202f REORGED; side 2 534 blocks sink f10f202f
+12:57:34.751 fg1 t=540.4 s H1 567 blocks sink 3a757d27 REORGED; H2 567 blocks sink 3a757d27 REORGED; side 2 567 blocks sink 3a757d27
+12:58:04.813 fg1 t=570.5 s H1 595 blocks sink b5217027 REORGED; H2 595 blocks sink b5217027 REORGED; side 2 595 blocks sink b5217027
+12:58:04.825 fg1 SUMMARY FAIL (attack-gate-off-expect-hold): side 2 held 0 bps of the blue blocks at the fork; fork depth 179 DAA against window 60; side 2 blue work 19683187 against H1 17459678 at the heal; H1 reorged at 480.3 s (0 refusal lines, knows side 2's tip: true); H2 reorged at 480.3 s (0 refusal lines, knows side 2's tip: true); side 2 kept its chain: true; FAILED CHECK every_honest_node_held, every_honest_node_logged_a_refusal
+12:58:04.825 fg1 summary: /srv/builds/igneum-wt-horizon/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-hold.json
diff --git a/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-reorg.json b/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-reorg.json
new file mode 100644
index 000000000..b45a58daa
--- /dev/null
+++ b/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-reorg.json
@@ -0,0 +1,930 @@
+{
+  "pass": true,
+  "expect": "reorg",
+  "case": "attack-gate-off-expect-reorg",
+  "mode": "attack",
+  "gate": "off",
+  "window": 60,
+  "joint": 240,
+  "split": 180,
+  "watch": 150,
+  "threads": {
+    "honest_each": 1,
+    "attacker_split": 3,
+    "attacker_joint": 0
+  },
+  "keys": {
+    "h1": "8da9ddee…",
+    "h2": "eda9cde4…",
+    "side2": "0e2c6fe2…"
+  },
+  "share_at_fork": {
+    "side2": 0,
+    "others": 120,
+    "side2_bps": 0
+  },
+  "fork_daa": 240,
+  "fork_depth_daa_at_heal": 191,
+  "sinks": {
+    "joint": {
+      "h1": {
+        "hash": "e66998c63f8f5d2f3f9108a5c61730f3d5ee06a0553f47e3bce314a0e4d7228e",
+        "blocks": 242,
+        "daa": 240,
+        "blue": 241,
+        "blueWork": "8689541",
+        "key": "8da9ddee…"
+      },
+      "h2": {
+        "hash": "e66998c63f8f5d2f3f9108a5c61730f3d5ee06a0553f47e3bce314a0e4d7228e",
+        "blocks": 242,
+        "daa": 240,
+        "blue": 241,
+        "blueWork": "8689541",
+        "key": "8da9ddee…"
+      },
+      "side2": {
+        "hash": "e66998c63f8f5d2f3f9108a5c61730f3d5ee06a0553f47e3bce314a0e4d7228e",
+        "blocks": 242,
+        "daa": 240,
+        "blue": 241,
+        "blueWork": "8689541",
+        "key": "8da9ddee…"
+      }
+    },
+    "split": {
+      "h1": {
+        "hash": "6e932c389f2ad01a39873317f9549f0a336e66a7c840669dd5bcb44a979a19ad",
+        "blocks": 421,
+        "daa": 420,
+        "blue": 421,
+        "blueWork": "14893198",
+        "key": "8da9ddee…"
+      },
+      "h2": {
+        "hash": "6e932c389f2ad01a39873317f9549f0a336e66a7c840669dd5bcb44a979a19ad",
+        "blocks": 421,
+        "daa": 420,
+        "blue": 421,
+        "blueWork": "14893198",
+        "key": "8da9ddee…"
+      },
+      "side2": {
+        "hash": "d93a1238a397f68337f4bc28d6197a61a32fbca176f3e7f4248b6b330e239cc8",
+        "blocks": 432,
+        "daa": 431,
+        "blue": 432,
+        "blueWork": "17470131",
+        "key": "0e2c6fe2…"
+      }
+    }
+  },
+  "per_node": {
+    "h1": {
+      "held": false,
+      "reorged": true,
+      "reorg_at_s": 510.4,
+      "knows_side2_tip": true,
+      "refusal_lines": 0
+    },
+    "h2": {
+      "held": false,
+      "reorged": true,
+      "reorg_at_s": 510.4,
+      "knows_side2_tip": true,
+      "refusal_lines": 0
+    }
+  },
+  "checks": {
+    "side2_under_a_third_at_fork": true,
+    "fork_deeper_than_window": true,
+    "side2_heavier_at_heal": true,
+    "every_honest_node_learned_side2_chain": true,
+    "every_honest_node_held": false,
+    "every_honest_node_reorged": true,
+    "every_honest_node_logged_a_refusal": false,
+    "no_honest_node_logged_a_refusal": true,
+    "side2_kept_its_chain": true
+  },
+  "failed_checks": [],
+  "refusal_example": null,
+  "samples": [
+    {
+      "t": 425.2,
+      "h1": {
+        "blocks": 426,
+        "sink": "719c3c11c14e54ed",
+        "daa": 425,
+        "blue": 426,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 426,
+        "sink": "719c3c11c14e54ed",
+        "daa": 425,
+        "blue": 426,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 438,
+        "sink": "c704e731f479e045",
+        "blue": 438,
+        "reorged": false
+      }
+    },
+    {
+      "t": 430.2,
+      "h1": {
+        "blocks": 432,
+        "sink": "fe308e06a3529e00",
+        "daa": 431,
+        "blue": 432,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 432,
+        "sink": "fe308e06a3529e00",
+        "daa": 431,
+        "blue": 432,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 442,
+        "sink": "7ca72d6ee8a28b46",
+        "blue": 442,
+        "reorged": false
+      }
+    },
+    {
+      "t": 435.2,
+      "h1": {
+        "blocks": 436,
+        "sink": "ba7e8b5f41caf493",
+        "daa": 435,
+        "blue": 436,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 436,
+        "sink": "ba7e8b5f41caf493",
+        "daa": 435,
+        "blue": 436,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 446,
+        "sink": "5459e40a1e9137e0",
+        "blue": 446,
+        "reorged": false
+      }
+    },
+    {
+      "t": 440.2,
+      "h1": {
+        "blocks": 438,
+        "sink": "19432a8a37b593ad",
+        "daa": 437,
+        "blue": 438,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 438,
+        "sink": "19432a8a37b593ad",
+        "daa": 437,
+        "blue": 438,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 455,
+        "sink": "5fdf67fc248f6500",
+        "blue": 455,
+        "reorged": false
+      }
+    },
+    {
+      "t": 445.3,
+      "h1": {
+        "blocks": 446,
+        "sink": "aada7bf1e3d16b25",
+        "daa": 445,
+        "blue": 446,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 446,
+        "sink": "aada7bf1e3d16b25",
+        "daa": 445,
+        "blue": 446,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 466,
+        "sink": "85ccafa8a9d39de0",
+        "blue": 466,
+        "reorged": false
+      }
+    },
+    {
+      "t": 450.3,
+      "h1": {
+        "blocks": 447,
+        "sink": "1761d6112c00d161",
+        "daa": 446,
+        "blue": 447,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 447,
+        "sink": "1761d6112c00d161",
+        "daa": 446,
+        "blue": 447,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 475,
+        "sink": "594fe7ff929c559f",
+        "blue": 475,
+        "reorged": false
+      }
+    },
+    {
+      "t": 455.3,
+      "h1": {
+        "blocks": 455,
+        "sink": "3d694806975e096e",
+        "daa": 454,
+        "blue": 455,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 455,
+        "sink": "3d694806975e096e",
+        "daa": 454,
+        "blue": 455,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 480,
+        "sink": "bf92fbb2a472d205",
+        "blue": 480,
+        "reorged": false
+      }
+    },
+    {
+      "t": 460.3,
+      "h1": {
+        "blocks": 461,
+        "sink": "4c2da8fcb362f14d",
+        "daa": 460,
+        "blue": 461,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 461,
+        "sink": "4c2da8fcb362f14d",
+        "daa": 460,
+        "blue": 461,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 482,
+        "sink": "90cc4fd0fac9bef2",
+        "blue": 482,
+        "reorged": false
+      }
+    },
+    {
+      "t": 465.3,
+      "h1": {
+        "blocks": 467,
+        "sink": "4cd5d4fda0703837",
+        "daa": 466,
+        "blue": 467,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 467,
+        "sink": "4cd5d4fda0703837",
+        "daa": 466,
+        "blue": 467,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 484,
+        "sink": "8d822c253a2939d6",
+        "blue": 484,
+        "reorged": false
+      }
+    },
+    {
+      "t": 470.3,
+      "h1": {
+        "blocks": 473,
+        "sink": "beeb70fa234a9a4b",
+        "daa": 472,
+        "blue": 473,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 473,
+        "sink": "beeb70fa234a9a4b",
+        "daa": 472,
+        "blue": 473,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 487,
+        "sink": "ed057653dec1d416",
+        "blue": 487,
+        "reorged": false
+      }
+    },
+    {
+      "t": 475.3,
+      "h1": {
+        "blocks": 480,
+        "sink": "47c9ab35c01f2f7d",
+        "daa": 479,
+        "blue": 480,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 480,
+        "sink": "47c9ab35c01f2f7d",
+        "daa": 479,
+        "blue": 480,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 495,
+        "sink": "072c31cf3c13877b",
+        "blue": 495,
+        "reorged": false
+      }
+    },
+    {
+      "t": 480.3,
+      "h1": {
+        "blocks": 486,
+        "sink": "918c05c7a79ce8ed",
+        "daa": 485,
+        "blue": 486,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 486,
+        "sink": "918c05c7a79ce8ed",
+        "daa": 485,
+        "blue": 486,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 504,
+        "sink": "6ab8526912a92786",
+        "blue": 504,
+        "reorged": false
+      }
+    },
+    {
+      "t": 485.4,
+      "h1": {
+        "blocks": 491,
+        "sink": "5b94825a96af8031",
+        "daa": 490,
+        "blue": 491,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 491,
+        "sink": "5b94825a96af8031",
+        "daa": 490,
+        "blue": 491,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 511,
+        "sink": "e5d2d2cf5ca14138",
+        "blue": 511,
+        "reorged": false
+      }
+    },
+    {
+      "t": 490.4,
+      "h1": {
+        "blocks": 494,
+        "sink": "7d0fd0b857ad553d",
+        "daa": 493,
+        "blue": 494,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 494,
+        "sink": "7d0fd0b857ad553d",
+        "daa": 493,
+        "blue": 494,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 518,
+        "sink": "6acadef70d9d2b7e",
+        "blue": 518,
+        "reorged": false
+      }
+    },
+    {
+      "t": 495.4,
+      "h1": {
+        "blocks": 500,
+        "sink": "4e35f238846e9802",
+        "daa": 499,
+        "blue": 500,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 500,
+        "sink": "4e35f238846e9802",
+        "daa": 499,
+        "blue": 500,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 524,
+        "sink": "a0e5e0544388677b",
+        "blue": 524,
+        "reorged": false
+      }
+    },
+    {
+      "t": 500.4,
+      "h1": {
+        "blocks": 502,
+        "sink": "1f3cf87f97e6661c",
+        "daa": 501,
+        "blue": 502,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 502,
+        "sink": "1f3cf87f97e6661c",
+        "daa": 501,
+        "blue": 502,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 530,
+        "sink": "f0ba9826edcf48e7",
+        "blue": 530,
+        "reorged": false
+      }
+    },
+    {
+      "t": 505.4,
+      "h1": {
+        "blocks": 509,
+        "sink": "532a873c7ad783c5",
+        "daa": 508,
+        "blue": 509,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 509,
+        "sink": "532a873c7ad783c5",
+        "daa": 508,
+        "blue": 509,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 537,
+        "sink": "b138a9d8ba0b3454",
+        "blue": 537,
+        "reorged": false
+      }
+    },
+    {
+      "t": 510.4,
+      "h1": {
+        "blocks": 545,
+        "sink": "b878077d471c2a73",
+        "daa": 544,
+        "blue": 545,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 545,
+        "sink": "b878077d471c2a73",
+        "daa": 544,
+        "blue": 545,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 545,
+        "sink": "b878077d471c2a73",
+        "blue": 545,
+        "reorged": false
+      }
+    },
+    {
+      "t": 515.4,
+      "h1": {
+        "blocks": 556,
+        "sink": "95bd60b5bf755ef1",
+        "daa": 555,
+        "blue": 556,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 556,
+        "sink": "95bd60b5bf755ef1",
+        "daa": 555,
+        "blue": 556,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 556,
+        "sink": "95bd60b5bf755ef1",
+        "blue": 556,
+        "reorged": false
+      }
+    },
+    {
+      "t": 520.4,
+      "h1": {
+        "blocks": 569,
+        "sink": "258f2c477b49756d",
+        "daa": 568,
+        "blue": 569,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 569,
+        "sink": "258f2c477b49756d",
+        "daa": 568,
+        "blue": 569,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 569,
+        "sink": "258f2c477b49756d",
+        "blue": 569,
+        "reorged": false
+      }
+    },
+    {
+      "t": 525.4,
+      "h1": {
+        "blocks": 571,
+        "sink": "e8cc9969d5d1dc10",
+        "daa": 570,
+        "blue": 571,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 571,
+        "sink": "e8cc9969d5d1dc10",
+        "daa": 570,
+        "blue": 571,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 571,
+        "sink": "e8cc9969d5d1dc10",
+        "blue": 571,
+        "reorged": false
+      }
+    },
+    {
+      "t": 530.5,
+      "h1": {
+        "blocks": 573,
+        "sink": "da3da53755578a2d",
+        "daa": 572,
+        "blue": 573,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 573,
+        "sink": "da3da53755578a2d",
+        "daa": 572,
+        "blue": 573,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 573,
+        "sink": "da3da53755578a2d",
+        "blue": 573,
+        "reorged": false
+      }
+    },
+    {
+      "t": 535.5,
+      "h1": {
+        "blocks": 576,
+        "sink": "65ba87e325c66754",
+        "daa": 575,
+        "blue": 576,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 576,
+        "sink": "65ba87e325c66754",
+        "daa": 575,
+        "blue": 576,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 576,
+        "sink": "65ba87e325c66754",
+        "blue": 576,
+        "reorged": false
+      }
+    },
+    {
+      "t": 540.5,
+      "h1": {
+        "blocks": 580,
+        "sink": "11e564345e74f2cb",
+        "daa": 579,
+        "blue": 580,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 580,
+        "sink": "11e564345e74f2cb",
+        "daa": 579,
+        "blue": 580,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 580,
+        "sink": "11e564345e74f2cb",
+        "blue": 580,
+        "reorged": false
+      }
+    },
+    {
+      "t": 545.5,
+      "h1": {
+        "blocks": 585,
+        "sink": "b1d2689648b6d765",
+        "daa": 584,
+        "blue": 585,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 585,
+        "sink": "b1d2689648b6d765",
+        "daa": 584,
+        "blue": 585,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 585,
+        "sink": "b1d2689648b6d765",
+        "blue": 585,
+        "reorged": false
+      }
+    },
+    {
+      "t": 550.5,
+      "h1": {
+        "blocks": 594,
+        "sink": "0856bc8c348725e9",
+        "daa": 593,
+        "blue": 594,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 594,
+        "sink": "0856bc8c348725e9",
+        "daa": 593,
+        "blue": 594,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 594,
+        "sink": "0856bc8c348725e9",
+        "blue": 594,
+        "reorged": false
+      }
+    },
+    {
+      "t": 555.5,
+      "h1": {
+        "blocks": 597,
+        "sink": "b0b25422dae4fab7",
+        "daa": 596,
+        "blue": 597,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 597,
+        "sink": "b0b25422dae4fab7",
+        "daa": 596,
+        "blue": 597,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 597,
+        "sink": "b0b25422dae4fab7",
+        "blue": 597,
+        "reorged": false
+      }
+    },
+    {
+      "t": 560.5,
+      "h1": {
+        "blocks": 606,
+        "sink": "733de568ec588157",
+        "daa": 605,
+        "blue": 606,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 606,
+        "sink": "733de568ec588157",
+        "daa": 605,
+        "blue": 606,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 606,
+        "sink": "733de568ec588157",
+        "blue": 606,
+        "reorged": false
+      }
+    },
+    {
+      "t": 565.5,
+      "h1": {
+        "blocks": 608,
+        "sink": "ad3c86d071a93e75",
+        "daa": 607,
+        "blue": 608,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 608,
+        "sink": "ad3c86d071a93e75",
+        "daa": 607,
+        "blue": 608,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 608,
+        "sink": "ad3c86d071a93e75",
+        "blue": 608,
+        "reorged": false
+      }
+    },
+    {
+      "t": 570.5,
+      "h1": {
+        "blocks": 613,
+        "sink": "a38c3c8af9f6290d",
+        "daa": 612,
+        "blue": 613,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 613,
+        "sink": "a38c3c8af9f6290d",
+        "daa": 612,
+        "blue": 613,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 613,
+        "sink": "a38c3c8af9f6290d",
+        "blue": 613,
+        "reorged": false
+      }
+    }
+  ],
+  "node": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneumd",
+  "miner": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneum-miner",
+  "slot": 0,
+  "ports": {
+    "base": 30690,
+    "suffix": 980
+  }
+}
diff --git a/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-reorg.log b/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-reorg.log
new file mode 100644
index 000000000..6d4ea6cb0
--- /dev/null
+++ b/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-reorg.log
@@ -0,0 +1,18 @@
+12:48:26.701 fg0 case attack-gate-off-expect-reorg: mode attack, gate off (window 60 DAA), joint 240 s, split 180 s, watch 150 s, honest 1 thread(s) each, attacker 3 (joint 0), expect reorg
+12:48:28.258 fg0 h1 up pid 480223 json 30692 p2p 30691
+12:48:29.769 fg0 h2 up pid 481517 json 30702 p2p 30701 addpeer 30691
+12:48:31.285 fg0 b up pid 482726 json 30712 p2p 30711 addpeer 30721,30722
+12:52:34.300 fg0 phase 1 done at 240.0 s: H1 242 blocks sink e66998c6 daa 240; H2 242 sink e66998c6; side 2 (b) 242 sink e66998c6; keys H1 8da9ddee H2 eda9cde4 side2 fresh (none yet)
+12:52:34.368 fg0 weight at the fork (last 120 blue blocks of H1's chain): side 2 0, others 120, side 2 0 bps
+12:52:34.370 fg0 links cut at 240.1 s; side 2 (b) now mines with 3 thread(s), the honest side with 1 each
+12:55:34.480 fg0 phase 2 done at 420.2 s: H1 421 blocks sink 6e932c38 daa 420 blue 421 work 14893198; side 2 432 sink d93a1238 daa 431 blue 432 work 17470131 (side 2 heavier: true); fork depth 191 DAA against window 60
+12:55:34.481 fg0 links restored at 420.2 s; watching H1 and H2 for 150 s
+12:56:04.569 fg0 t=450.3 s H1 447 blocks sink 1761d611 held; H2 447 blocks sink 1761d611 held; side 2 475 blocks sink 594fe7ff
+12:56:34.644 fg0 t=480.4 s H1 486 blocks sink 918c05c7 held; H2 486 blocks sink 918c05c7 held; side 2 504 blocks sink 6ab85269
+12:57:04.714 fg0 H1 left its pre-cut chain at 510.4 s: sink b878077d471c2a73 by eda9cde4
+12:57:04.717 fg0 H2 left its pre-cut chain at 510.4 s: sink b878077d471c2a73 by eda9cde4
+12:57:04.719 fg0 t=510.4 s H1 545 blocks sink b878077d REORGED; H2 545 blocks sink b878077d REORGED; side 2 545 blocks sink b878077d
+12:57:34.769 fg0 t=540.5 s H1 580 blocks sink 11e56434 REORGED; H2 580 blocks sink 11e56434 REORGED; side 2 580 blocks sink 11e56434
+12:58:04.814 fg0 t=570.5 s H1 613 blocks sink a38c3c8a REORGED; H2 613 blocks sink a38c3c8a REORGED; side 2 613 blocks sink a38c3c8a
+12:58:04.822 fg0 SUMMARY PASS (attack-gate-off-expect-reorg): side 2 held 0 bps of the blue blocks at the fork; fork depth 191 DAA against window 60; side 2 blue work 17470131 against H1 14893198 at the heal; H1 reorged at 510.4 s (0 refusal lines, knows side 2's tip: true); H2 reorged at 510.4 s (0 refusal lines, knows side 2's tip: true); side 2 kept its chain: true
+12:58:04.822 fg0 summary: /srv/builds/igneum-wt-horizon/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-reorg.json
diff --git a/docs/plans/mission-item-4-gate/fork-gate-attack-gate-on-expect-hold.json b/docs/plans/mission-item-4-gate/fork-gate-attack-gate-on-expect-hold.json
new file mode 100644
index 000000000..546ae42c8
--- /dev/null
+++ b/docs/plans/mission-item-4-gate/fork-gate-attack-gate-on-expect-hold.json
@@ -0,0 +1,930 @@
+{
+  "pass": true,
+  "expect": "hold",
+  "case": "attack-gate-on-expect-hold",
+  "mode": "attack",
+  "gate": "on",
+  "window": 60,
+  "joint": 240,
+  "split": 180,
+  "watch": 150,
+  "threads": {
+    "honest_each": 1,
+    "attacker_split": 3,
+    "attacker_joint": 0
+  },
+  "keys": {
+    "h1": "8da9ddee…",
+    "h2": "eda9cde4…",
+    "side2": "0e2c6fe2…"
+  },
+  "share_at_fork": {
+    "side2": 0,
+    "others": 121,
+    "side2_bps": 0
+  },
+  "fork_daa": 233,
+  "fork_depth_daa_at_heal": 197,
+  "sinks": {
+    "joint": {
+      "h1": {
+        "hash": "7ed68743f22e711490406bd380cf66fff94579fcc981344c317a46c18cbc61bb",
+        "blocks": 234,
+        "daa": 233,
+        "blue": 234,
+        "blueWork": "8862250",
+        "key": "eda9cde4…"
+      },
+      "h2": {
+        "hash": "7ed68743f22e711490406bd380cf66fff94579fcc981344c317a46c18cbc61bb",
+        "blocks": 234,
+        "daa": 233,
+        "blue": 234,
+        "blueWork": "8862250",
+        "key": "eda9cde4…"
+      },
+      "side2": {
+        "hash": "7ed68743f22e711490406bd380cf66fff94579fcc981344c317a46c18cbc61bb",
+        "blocks": 234,
+        "daa": 233,
+        "blue": 234,
+        "blueWork": "8862250",
+        "key": "eda9cde4…"
+      }
+    },
+    "split": {
+      "h1": {
+        "hash": "036cfe568f3d403351b338ea41b7069ad4eae0ce95308436a25b6c7aa4c1372a",
+        "blocks": 396,
+        "daa": 395,
+        "blue": 396,
+        "blueWork": "14807915",
+        "key": "8da9ddee…"
+      },
+      "h2": {
+        "hash": "036cfe568f3d403351b338ea41b7069ad4eae0ce95308436a25b6c7aa4c1372a",
+        "blocks": 396,
+        "daa": 395,
+        "blue": 396,
+        "blueWork": "14807915",
+        "key": "8da9ddee…"
+      },
+      "side2": {
+        "hash": "abb93c2318f6c2ebdbd4e14a50b3d73ba7f483b8b06b18666e1015d038d4011a",
+        "blocks": 431,
+        "daa": 430,
+        "blue": 431,
+        "blueWork": "20297242",
+        "key": "0e2c6fe2…"
+      }
+    }
+  },
+  "per_node": {
+    "h1": {
+      "held": true,
+      "reorged": false,
+      "reorg_at_s": null,
+      "knows_side2_tip": true,
+      "refusal_lines": 177
+    },
+    "h2": {
+      "held": true,
+      "reorged": false,
+      "reorg_at_s": null,
+      "knows_side2_tip": true,
+      "refusal_lines": 177
+    }
+  },
+  "checks": {
+    "side2_under_a_third_at_fork": true,
+    "fork_deeper_than_window": true,
+    "side2_heavier_at_heal": true,
+    "every_honest_node_learned_side2_chain": true,
+    "every_honest_node_held": true,
+    "every_honest_node_reorged": false,
+    "every_honest_node_logged_a_refusal": true,
+    "no_honest_node_logged_a_refusal": false,
+    "side2_kept_its_chain": true
+  },
+  "failed_checks": [],
+  "refusal_example": "Fork choice: block 41225a00fb38b6394540a5707443bd70e678484cbd20aa3fa8e807bb24df8d4a forks 252 DAA back from the sink's chain and its builders hold 0.00% of the weight table at the fork (under one third); not a sink candidate (ledger 51-percent rank 2)",
+  "samples": [
+    {
+      "t": 425.2,
+      "h1": {
+        "blocks": 407,
+        "sink": "b9b5fef0daea5b74",
+        "daa": 406,
+        "blue": 407,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 407,
+        "sink": "b9b5fef0daea5b74",
+        "daa": 406,
+        "blue": 407,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 436,
+        "sink": "b87c6327c3fc8298",
+        "blue": 436,
+        "reorged": false
+      }
+    },
+    {
+      "t": 430.2,
+      "h1": {
+        "blocks": 412,
+        "sink": "cd9991f248c9bf46",
+        "daa": 411,
+        "blue": 412,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 412,
+        "sink": "cd9991f248c9bf46",
+        "daa": 411,
+        "blue": 412,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 439,
+        "sink": "4c1b609fad53a391",
+        "blue": 439,
+        "reorged": false
+      }
+    },
+    {
+      "t": 435.2,
+      "h1": {
+        "blocks": 417,
+        "sink": "b2bb0dc00c197917",
+        "daa": 416,
+        "blue": 417,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 417,
+        "sink": "b2bb0dc00c197917",
+        "daa": 416,
+        "blue": 417,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 444,
+        "sink": "e382cbd3ac4dcf26",
+        "blue": 444,
+        "reorged": false
+      }
+    },
+    {
+      "t": 440.2,
+      "h1": {
+        "blocks": 422,
+        "sink": "b711c4c23605870d",
+        "daa": 421,
+        "blue": 422,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 422,
+        "sink": "b711c4c23605870d",
+        "daa": 421,
+        "blue": 422,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 446,
+        "sink": "c35dab954cd4acf4",
+        "blue": 446,
+        "reorged": false
+      }
+    },
+    {
+      "t": 445.2,
+      "h1": {
+        "blocks": 428,
+        "sink": "f99b9d3dbc93d6c8",
+        "daa": 427,
+        "blue": 428,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 428,
+        "sink": "f99b9d3dbc93d6c8",
+        "daa": 427,
+        "blue": 428,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 449,
+        "sink": "d92f53e2d140db35",
+        "blue": 449,
+        "reorged": false
+      }
+    },
+    {
+      "t": 450.3,
+      "h1": {
+        "blocks": 431,
+        "sink": "1e9a17dfc27a2670",
+        "daa": 430,
+        "blue": 431,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 431,
+        "sink": "1e9a17dfc27a2670",
+        "daa": 430,
+        "blue": 431,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 456,
+        "sink": "162c5de6d4f74ea9",
+        "blue": 456,
+        "reorged": false
+      }
+    },
+    {
+      "t": 455.3,
+      "h1": {
+        "blocks": 438,
+        "sink": "65be332f457b64e0",
+        "daa": 437,
+        "blue": 438,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 438,
+        "sink": "65be332f457b64e0",
+        "daa": 437,
+        "blue": 438,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 461,
+        "sink": "6b7998086b33a85d",
+        "blue": 461,
+        "reorged": false
+      }
+    },
+    {
+      "t": 460.3,
+      "h1": {
+        "blocks": 446,
+        "sink": "5ee05b91ff342422",
+        "daa": 445,
+        "blue": 446,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 446,
+        "sink": "5ee05b91ff342422",
+        "daa": 445,
+        "blue": 446,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 468,
+        "sink": "2ef3594b2514a766",
+        "blue": 468,
+        "reorged": false
+      }
+    },
+    {
+      "t": 465.3,
+      "h1": {
+        "blocks": 451,
+        "sink": "faad0b35cf941017",
+        "daa": 450,
+        "blue": 451,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 451,
+        "sink": "faad0b35cf941017",
+        "daa": 450,
+        "blue": 451,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 471,
+        "sink": "e57eb146c13fa041",
+        "blue": 471,
+        "reorged": false
+      }
+    },
+    {
+      "t": 470.3,
+      "h1": {
+        "blocks": 454,
+        "sink": "b5f88fdf5097139b",
+        "daa": 453,
+        "blue": 454,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 454,
+        "sink": "b5f88fdf5097139b",
+        "daa": 453,
+        "blue": 454,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 479,
+        "sink": "bac0a7b389fb2418",
+        "blue": 479,
+        "reorged": false
+      }
+    },
+    {
+      "t": 475.3,
+      "h1": {
+        "blocks": 463,
+        "sink": "e93acb17237cc9b3",
+        "daa": 462,
+        "blue": 463,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 463,
+        "sink": "e93acb17237cc9b3",
+        "daa": 462,
+        "blue": 463,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 481,
+        "sink": "7a533b847de36a0c",
+        "blue": 481,
+        "reorged": false
+      }
+    },
+    {
+      "t": 480.3,
+      "h1": {
+        "blocks": 467,
+        "sink": "ea2b7270dba4deba",
+        "daa": 466,
+        "blue": 467,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 467,
+        "sink": "ea2b7270dba4deba",
+        "daa": 466,
+        "blue": 467,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 485,
+        "sink": "5f36be5a27dc4f1f",
+        "blue": 485,
+        "reorged": false
+      }
+    },
+    {
+      "t": 485.3,
+      "h1": {
+        "blocks": 470,
+        "sink": "caab7c55e1185c44",
+        "daa": 469,
+        "blue": 470,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 470,
+        "sink": "caab7c55e1185c44",
+        "daa": 469,
+        "blue": 470,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 490,
+        "sink": "9b058d11e4a8a864",
+        "blue": 490,
+        "reorged": false
+      }
+    },
+    {
+      "t": 490.4,
+      "h1": {
+        "blocks": 472,
+        "sink": "19057874449c22ea",
+        "daa": 471,
+        "blue": 472,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 472,
+        "sink": "19057874449c22ea",
+        "daa": 471,
+        "blue": 472,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 493,
+        "sink": "422c79a9ec4780dd",
+        "blue": 493,
+        "reorged": false
+      }
+    },
+    {
+      "t": 495.4,
+      "h1": {
+        "blocks": 475,
+        "sink": "b6f0161d81faa3e9",
+        "daa": 474,
+        "blue": 475,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 475,
+        "sink": "b6f0161d81faa3e9",
+        "daa": 474,
+        "blue": 475,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 497,
+        "sink": "33c53267da1c7bd5",
+        "blue": 497,
+        "reorged": false
+      }
+    },
+    {
+      "t": 500.4,
+      "h1": {
+        "blocks": 482,
+        "sink": "6e821ff35e24b700",
+        "daa": 481,
+        "blue": 482,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 482,
+        "sink": "6e821ff35e24b700",
+        "daa": 481,
+        "blue": 482,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 501,
+        "sink": "6536fa666794da92",
+        "blue": 501,
+        "reorged": false
+      }
+    },
+    {
+      "t": 505.4,
+      "h1": {
+        "blocks": 486,
+        "sink": "bee5af11ed677228",
+        "daa": 485,
+        "blue": 486,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 486,
+        "sink": "bee5af11ed677228",
+        "daa": 485,
+        "blue": 486,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 510,
+        "sink": "be1419603638e1fb",
+        "blue": 510,
+        "reorged": false
+      }
+    },
+    {
+      "t": 510.4,
+      "h1": {
+        "blocks": 491,
+        "sink": "ed71ec00678a9e10",
+        "daa": 490,
+        "blue": 491,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 491,
+        "sink": "ed71ec00678a9e10",
+        "daa": 490,
+        "blue": 491,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 515,
+        "sink": "7b32f850c803ef02",
+        "blue": 515,
+        "reorged": false
+      }
+    },
+    {
+      "t": 515.4,
+      "h1": {
+        "blocks": 499,
+        "sink": "ed904ccbc28c9980",
+        "daa": 498,
+        "blue": 499,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 499,
+        "sink": "ed904ccbc28c9980",
+        "daa": 498,
+        "blue": 499,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 519,
+        "sink": "a26ebf100dcba0c2",
+        "blue": 519,
+        "reorged": false
+      }
+    },
+    {
+      "t": 520.4,
+      "h1": {
+        "blocks": 503,
+        "sink": "462b0c2c35c67c54",
+        "daa": 502,
+        "blue": 503,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 503,
+        "sink": "462b0c2c35c67c54",
+        "daa": 502,
+        "blue": 503,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 526,
+        "sink": "aaaebc1389fe11fd",
+        "blue": 526,
+        "reorged": false
+      }
+    },
+    {
+      "t": 525.4,
+      "h1": {
+        "blocks": 504,
+        "sink": "87f25e6a386a8165",
+        "daa": 503,
+        "blue": 504,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 504,
+        "sink": "87f25e6a386a8165",
+        "daa": 503,
+        "blue": 504,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 529,
+        "sink": "c096bda65c99e6f8",
+        "blue": 529,
+        "reorged": false
+      }
+    },
+    {
+      "t": 530.4,
+      "h1": {
+        "blocks": 510,
+        "sink": "6c5d1398a7445010",
+        "daa": 509,
+        "blue": 510,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 510,
+        "sink": "6c5d1398a7445010",
+        "daa": 509,
+        "blue": 510,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 533,
+        "sink": "3341a65b2b284f17",
+        "blue": 533,
+        "reorged": false
+      }
+    },
+    {
+      "t": 535.4,
+      "h1": {
+        "blocks": 514,
+        "sink": "0d661c0b8cc34ab8",
+        "daa": 513,
+        "blue": 514,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 514,
+        "sink": "0d661c0b8cc34ab8",
+        "daa": 513,
+        "blue": 514,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 542,
+        "sink": "7c3a8038df112ee7",
+        "blue": 542,
+        "reorged": false
+      }
+    },
+    {
+      "t": 540.4,
+      "h1": {
+        "blocks": 525,
+        "sink": "f2b83fc149654b8d",
+        "daa": 524,
+        "blue": 525,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 525,
+        "sink": "f2b83fc149654b8d",
+        "daa": 524,
+        "blue": 525,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 545,
+        "sink": "36e6ba6e49e7c6f2",
+        "blue": 545,
+        "reorged": false
+      }
+    },
+    {
+      "t": 545.5,
+      "h1": {
+        "blocks": 533,
+        "sink": "8f1d9ad77edf47d0",
+        "daa": 532,
+        "blue": 533,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 533,
+        "sink": "8f1d9ad77edf47d0",
+        "daa": 532,
+        "blue": 533,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 554,
+        "sink": "857f2b7d99ddcba6",
+        "blue": 554,
+        "reorged": false
+      }
+    },
+    {
+      "t": 550.5,
+      "h1": {
+        "blocks": 537,
+        "sink": "4cd35471c65af8ff",
+        "daa": 536,
+        "blue": 537,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 537,
+        "sink": "4cd35471c65af8ff",
+        "daa": 536,
+        "blue": 537,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 560,
+        "sink": "5ed4bc501713930a",
+        "blue": 560,
+        "reorged": false
+      }
+    },
+    {
+      "t": 555.5,
+      "h1": {
+        "blocks": 544,
+        "sink": "1174f796fda59e3e",
+        "daa": 543,
+        "blue": 544,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 544,
+        "sink": "1174f796fda59e3e",
+        "daa": 543,
+        "blue": 544,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 565,
+        "sink": "f7d136350536fa6b",
+        "blue": 565,
+        "reorged": false
+      }
+    },
+    {
+      "t": 560.5,
+      "h1": {
+        "blocks": 548,
+        "sink": "f6ed678d1b0a96f8",
+        "daa": 547,
+        "blue": 548,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 548,
+        "sink": "f6ed678d1b0a96f8",
+        "daa": 547,
+        "blue": 548,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 568,
+        "sink": "37ac0328bf8f53e4",
+        "blue": 568,
+        "reorged": false
+      }
+    },
+    {
+      "t": 565.5,
+      "h1": {
+        "blocks": 556,
+        "sink": "86f4c28c6ba82275",
+        "daa": 555,
+        "blue": 556,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 556,
+        "sink": "86f4c28c6ba82275",
+        "daa": 555,
+        "blue": 556,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 572,
+        "sink": "9d9ec576b2742464",
+        "blue": 572,
+        "reorged": false
+      }
+    },
+    {
+      "t": 570.5,
+      "h1": {
+        "blocks": 560,
+        "sink": "3210de1f85cbfc76",
+        "daa": 559,
+        "blue": 560,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 560,
+        "sink": "3210de1f85cbfc76",
+        "daa": 559,
+        "blue": 560,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 574,
+        "sink": "3496b576346db4bb",
+        "blue": 574,
+        "reorged": false
+      }
+    }
+  ],
+  "node": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneumd",
+  "miner": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneum-miner",
+  "slot": 2,
+  "ports": {
+    "base": 30770,
+    "suffix": 982
+  }
+}
diff --git a/docs/plans/mission-item-4-gate/fork-gate-attack-gate-on-expect-hold.log b/docs/plans/mission-item-4-gate/fork-gate-attack-gate-on-expect-hold.log
new file mode 100644
index 000000000..fb2480aee
--- /dev/null
+++ b/docs/plans/mission-item-4-gate/fork-gate-attack-gate-on-expect-hold.log
@@ -0,0 +1,16 @@
+12:48:26.709 fg2 case attack-gate-on-expect-hold: mode attack, gate on (window 60 DAA), joint 240 s, split 180 s, watch 150 s, honest 1 thread(s) each, attacker 3 (joint 0), expect hold
+12:48:28.273 fg2 h1 up pid 480230 json 30772 p2p 30771
+12:48:29.784 fg2 h2 up pid 481529 json 30782 p2p 30781 addpeer 30771
+12:48:31.299 fg2 b up pid 482751 json 30792 p2p 30791 addpeer 30801,30802
+12:52:34.314 fg2 phase 1 done at 240.0 s: H1 234 blocks sink 7ed68743 daa 233; H2 234 sink 7ed68743; side 2 (b) 234 sink 7ed68743; keys H1 8da9ddee H2 eda9cde4 side2 fresh (none yet)
+12:52:34.371 fg2 weight at the fork (last 121 blue blocks of H1's chain): side 2 0, others 121, side 2 0 bps
+12:52:34.375 fg2 links cut at 240.1 s; side 2 (b) now mines with 3 thread(s), the honest side with 1 each
+12:55:34.483 fg2 phase 2 done at 420.2 s: H1 396 blocks sink 036cfe56 daa 395 blue 396 work 14807915; side 2 431 sink abb93c23 daa 430 blue 431 work 20297242 (side 2 heavier: true); fork depth 197 DAA against window 60
+12:55:34.484 fg2 links restored at 420.2 s; watching H1 and H2 for 150 s
+12:56:04.568 fg2 t=450.3 s H1 431 blocks sink 1e9a17df held; H2 431 blocks sink 1e9a17df held; side 2 456 blocks sink 162c5de6
+12:56:34.640 fg2 t=480.3 s H1 467 blocks sink ea2b7270 held; H2 467 blocks sink ea2b7270 held; side 2 485 blocks sink 5f36be5a
+12:57:04.717 fg2 t=510.4 s H1 491 blocks sink ed71ec00 held; H2 491 blocks sink ed71ec00 held; side 2 515 blocks sink 7b32f850
+12:57:34.757 fg2 t=540.5 s H1 525 blocks sink f2b83fc1 held; H2 525 blocks sink f2b83fc1 held; side 2 545 blocks sink 36e6ba6e
+12:58:04.809 fg2 t=570.5 s H1 560 blocks sink 3210de1f held; H2 560 blocks sink 3210de1f held; side 2 574 blocks sink 3496b576
+12:58:04.822 fg2 SUMMARY PASS (attack-gate-on-expect-hold): side 2 held 0 bps of the blue blocks at the fork; fork depth 197 DAA against window 60; side 2 blue work 20297242 against H1 14807915 at the heal; H1 held (177 refusal lines, knows side 2's tip: true); H2 held (177 refusal lines, knows side 2's tip: true); side 2 kept its chain: true
+12:58:04.822 fg2 summary: /srv/builds/igneum-wt-horizon/docs/plans/mission-item-4-gate/fork-gate-attack-gate-on-expect-hold.json
diff --git a/docs/plans/mission-item-4-gate/fork-gate-partition-gate-off-expect-reorg.json b/docs/plans/mission-item-4-gate/fork-gate-partition-gate-off-expect-reorg.json
new file mode 100644
index 000000000..7787b6d26
--- /dev/null
+++ b/docs/plans/mission-item-4-gate/fork-gate-partition-gate-off-expect-reorg.json
@@ -0,0 +1,653 @@
+{
+  "pass": true,
+  "expect": "reorg",
+  "case": "partition-gate-off-expect-reorg",
+  "mode": "partition",
+  "gate": "off",
+  "window": 60,
+  "joint": 240,
+  "split": 180,
+  "watch": 150,
+  "threads": {
+    "honest_each": 1,
+    "attacker_split": 3,
+    "attacker_joint": 1
+  },
+  "keys": {
+    "h1": "8da9ddee…",
+    "h2": null,
+    "side2": "eda9cde4…"
+  },
+  "share_at_fork": {
+    "side2": 67,
+    "others": 53,
+    "side2_bps": 5583
+  },
+  "fork_daa": 244,
+  "fork_depth_daa_at_heal": 191,
+  "sinks": {
+    "joint": {
+      "h1": {
+        "hash": "58126c351aa6324a992a47fa66cca22369450c9835d312772c87d3e1aeb409a0",
+        "blocks": 245,
+        "daa": 244,
+        "blue": 245,
+        "blueWork": "9558440",
+        "key": "8da9ddee…"
+      },
+      "h2": {
+        "hash": "58126c351aa6324a992a47fa66cca22369450c9835d312772c87d3e1aeb409a0",
+        "blocks": 245,
+        "daa": 244,
+        "blue": 245,
+        "blueWork": "9558440",
+        "key": "8da9ddee…"
+      },
+      "side2": {
+        "hash": "58126c351aa6324a992a47fa66cca22369450c9835d312772c87d3e1aeb409a0",
+        "blocks": 245,
+        "daa": 244,
+        "blue": 245,
+        "blueWork": "9558440",
+        "key": "8da9ddee…"
+      }
+    },
+    "split": {
+      "h1": {
+        "hash": "a27a341c694aacf22b1a78f44d433e4104f58b23533afb73b7ee6fb9aa37afe4",
+        "blocks": 405,
+        "daa": 404,
+        "blue": 405,
+        "blueWork": "12270631",
+        "key": "8da9ddee…"
+      },
+      "h2": {
+        "hash": "f9181a06c0db716fe4ed200f6f0046c9cb8fae2eb57dd7da4697a268c434a232",
+        "blocks": 436,
+        "daa": 435,
+        "blue": 436,
+        "blueWork": "19576159",
+        "key": "eda9cde4…"
+      },
+      "side2": {
+        "hash": "f9181a06c0db716fe4ed200f6f0046c9cb8fae2eb57dd7da4697a268c434a232",
+        "blocks": 436,
+        "daa": 435,
+        "blue": 436,
+        "blueWork": "19576159",
+        "key": "eda9cde4…"
+      }
+    }
+  },
+  "per_node": {
+    "h1": {
+      "held": false,
+      "reorged": true,
+      "reorg_at_s": 507.4,
+      "knows_side2_tip": true,
+      "refusal_lines": 0
+    }
+  },
+  "checks": {
+    "side2_under_a_third_at_fork": false,
+    "fork_deeper_than_window": true,
+    "side2_heavier_at_heal": true,
+    "every_honest_node_learned_side2_chain": true,
+    "every_honest_node_held": false,
+    "every_honest_node_reorged": true,
+    "every_honest_node_logged_a_refusal": false,
+    "no_honest_node_logged_a_refusal": true,
+    "side2_kept_its_chain": true
+  },
+  "failed_checks": [],
+  "refusal_example": null,
+  "samples": [
+    {
+      "t": 427.2,
+      "h1": {
+        "blocks": 411,
+        "sink": "d783538ac11687a9",
+        "daa": 410,
+        "blue": 411,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 439,
+        "sink": "aa3da0091db61498",
+        "blue": 439,
+        "reorged": false
+      }
+    },
+    {
+      "t": 432.2,
+      "h1": {
+        "blocks": 416,
+        "sink": "5084ccaac5b21e34",
+        "daa": 415,
+        "blue": 416,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 448,
+        "sink": "c98585f0a1f24913",
+        "blue": 448,
+        "reorged": false
+      }
+    },
+    {
+      "t": 437.2,
+      "h1": {
+        "blocks": 421,
+        "sink": "950f8b1c7d4cac21",
+        "daa": 420,
+        "blue": 421,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 452,
+        "sink": "c4ad3925b38e9285",
+        "blue": 452,
+        "reorged": false
+      }
+    },
+    {
+      "t": 442.2,
+      "h1": {
+        "blocks": 424,
+        "sink": "767cbc91083a48b0",
+        "daa": 423,
+        "blue": 424,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 455,
+        "sink": "c91b500a6d256eb3",
+        "blue": 455,
+        "reorged": false
+      }
+    },
+    {
+      "t": 447.3,
+      "h1": {
+        "blocks": 429,
+        "sink": "d36268f977a04b6a",
+        "daa": 428,
+        "blue": 429,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 465,
+        "sink": "c5a91c0c5352b0d6",
+        "blue": 465,
+        "reorged": false
+      }
+    },
+    {
+      "t": 452.3,
+      "h1": {
+        "blocks": 438,
+        "sink": "a7ecf244074b481d",
+        "daa": 437,
+        "blue": 438,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 468,
+        "sink": "cd8cfb427f0c78e4",
+        "blue": 468,
+        "reorged": false
+      }
+    },
+    {
+      "t": 457.3,
+      "h1": {
+        "blocks": 441,
+        "sink": "29f8733c4ec6fa4b",
+        "daa": 440,
+        "blue": 441,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 473,
+        "sink": "277bfdb7682804f9",
+        "blue": 473,
+        "reorged": false
+      }
+    },
+    {
+      "t": 462.3,
+      "h1": {
+        "blocks": 451,
+        "sink": "ae072b1106d34635",
+        "daa": 450,
+        "blue": 451,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 476,
+        "sink": "d0f88a7c220ff170",
+        "blue": 476,
+        "reorged": false
+      }
+    },
+    {
+      "t": 467.3,
+      "h1": {
+        "blocks": 458,
+        "sink": "9fcfa1edabf60dd7",
+        "daa": 457,
+        "blue": 458,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 486,
+        "sink": "9f66b943e3b972b7",
+        "blue": 486,
+        "reorged": false
+      }
+    },
+    {
+      "t": 472.3,
+      "h1": {
+        "blocks": 462,
+        "sink": "8dcef0d603690a6e",
+        "daa": 461,
+        "blue": 462,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 493,
+        "sink": "a70a07e96280ab1e",
+        "blue": 493,
+        "reorged": false
+      }
+    },
+    {
+      "t": 477.3,
+      "h1": {
+        "blocks": 464,
+        "sink": "c6dceb1dfe662639",
+        "daa": 463,
+        "blue": 464,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 495,
+        "sink": "1b6074e848285a01",
+        "blue": 495,
+        "reorged": false
+      }
+    },
+    {
+      "t": 482.4,
+      "h1": {
+        "blocks": 468,
+        "sink": "97b7a7a0a8248207",
+        "daa": 467,
+        "blue": 468,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 500,
+        "sink": "a4045188d0e6fb97",
+        "blue": 500,
+        "reorged": false
+      }
+    },
+    {
+      "t": 487.4,
+      "h1": {
+        "blocks": 472,
+        "sink": "2326f1a0ffea21d8",
+        "daa": 471,
+        "blue": 472,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 504,
+        "sink": "813c0c0f3fe0d62b",
+        "blue": 504,
+        "reorged": false
+      }
+    },
+    {
+      "t": 492.4,
+      "h1": {
+        "blocks": 476,
+        "sink": "2e8644b1907a9120",
+        "daa": 475,
+        "blue": 476,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 508,
+        "sink": "9345acb132973ee6",
+        "blue": 508,
+        "reorged": false
+      }
+    },
+    {
+      "t": 497.4,
+      "h1": {
+        "blocks": 481,
+        "sink": "04a443536671ab8f",
+        "daa": 480,
+        "blue": 481,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 512,
+        "sink": "0db73c40f531667d",
+        "blue": 512,
+        "reorged": false
+      }
+    },
+    {
+      "t": 502.4,
+      "h1": {
+        "blocks": 487,
+        "sink": "9afd673d306dc43c",
+        "daa": 486,
+        "blue": 487,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 519,
+        "sink": "e749191f14932323",
+        "blue": 519,
+        "reorged": false
+      }
+    },
+    {
+      "t": 507.4,
+      "h1": {
+        "blocks": 527,
+        "sink": "afed1d222ea7304d",
+        "daa": 526,
+        "blue": 527,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 527,
+        "sink": "afed1d222ea7304d",
+        "blue": 527,
+        "reorged": false
+      }
+    },
+    {
+      "t": 512.4,
+      "h1": {
+        "blocks": 538,
+        "sink": "54deb8450401f863",
+        "daa": 537,
+        "blue": 538,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 538,
+        "sink": "54deb8450401f863",
+        "blue": 538,
+        "reorged": false
+      }
+    },
+    {
+      "t": 517.4,
+      "h1": {
+        "blocks": 543,
+        "sink": "089737446a988ecf",
+        "daa": 542,
+        "blue": 543,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 543,
+        "sink": "089737446a988ecf",
+        "blue": 543,
+        "reorged": false
+      }
+    },
+    {
+      "t": 522.4,
+      "h1": {
+        "blocks": 547,
+        "sink": "fddba72379711067",
+        "daa": 546,
+        "blue": 547,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 547,
+        "sink": "fddba72379711067",
+        "blue": 547,
+        "reorged": false
+      }
+    },
+    {
+      "t": 527.4,
+      "h1": {
+        "blocks": 553,
+        "sink": "d090e72490be6b7a",
+        "daa": 552,
+        "blue": 553,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 553,
+        "sink": "d090e72490be6b7a",
+        "blue": 553,
+        "reorged": false
+      }
+    },
+    {
+      "t": 532.4,
+      "h1": {
+        "blocks": 561,
+        "sink": "1caf40533f6a2857",
+        "daa": 560,
+        "blue": 561,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 561,
+        "sink": "1caf40533f6a2857",
+        "blue": 561,
+        "reorged": false
+      }
+    },
+    {
+      "t": 537.4,
+      "h1": {
+        "blocks": 573,
+        "sink": "e5b85c33b2b6aa09",
+        "daa": 572,
+        "blue": 573,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 573,
+        "sink": "e5b85c33b2b6aa09",
+        "blue": 573,
+        "reorged": false
+      }
+    },
+    {
+      "t": 542.4,
+      "h1": {
+        "blocks": 578,
+        "sink": "317e329b8505cf1e",
+        "daa": 577,
+        "blue": 578,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 578,
+        "sink": "317e329b8505cf1e",
+        "blue": 578,
+        "reorged": false
+      }
+    },
+    {
+      "t": 547.5,
+      "h1": {
+        "blocks": 581,
+        "sink": "e19cd0330c3cdf25",
+        "daa": 580,
+        "blue": 581,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 581,
+        "sink": "e19cd0330c3cdf25",
+        "blue": 581,
+        "reorged": false
+      }
+    },
+    {
+      "t": 552.5,
+      "h1": {
+        "blocks": 586,
+        "sink": "38f228d7ffc3d0c1",
+        "daa": 585,
+        "blue": 586,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 586,
+        "sink": "38f228d7ffc3d0c1",
+        "blue": 586,
+        "reorged": false
+      }
+    },
+    {
+      "t": 557.5,
+      "h1": {
+        "blocks": 592,
+        "sink": "ae515bf3d13e4865",
+        "daa": 591,
+        "blue": 592,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 592,
+        "sink": "ae515bf3d13e4865",
+        "blue": 592,
+        "reorged": false
+      }
+    },
+    {
+      "t": 562.5,
+      "h1": {
+        "blocks": 595,
+        "sink": "eeade53e9149c05a",
+        "daa": 594,
+        "blue": 595,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 595,
+        "sink": "eeade53e9149c05a",
+        "blue": 595,
+        "reorged": false
+      }
+    },
+    {
+      "t": 567.5,
+      "h1": {
+        "blocks": 597,
+        "sink": "a939e8caebf875d6",
+        "daa": 596,
+        "blue": 597,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 597,
+        "sink": "a939e8caebf875d6",
+        "blue": 597,
+        "reorged": false
+      }
+    },
+    {
+      "t": 572.5,
+      "h1": {
+        "blocks": 605,
+        "sink": "1e585f80dc1050fa",
+        "daa": 604,
+        "blue": 605,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 605,
+        "sink": "1e585f80dc1050fa",
+        "blue": 605,
+        "reorged": false
+      }
+    }
+  ],
+  "node": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneumd",
+  "miner": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneum-miner",
+  "slot": 5,
+  "ports": {
+    "base": 30890,
+    "suffix": 985
+  }
+}
diff --git a/docs/plans/mission-item-4-gate/fork-gate-partition-gate-off-expect-reorg.log b/docs/plans/mission-item-4-gate/fork-gate-partition-gate-off-expect-reorg.log
new file mode 100644
index 000000000..63e1e20cc
--- /dev/null
+++ b/docs/plans/mission-item-4-gate/fork-gate-partition-gate-off-expect-reorg.log
@@ -0,0 +1,16 @@
+12:48:26.732 fg5 case partition-gate-off-expect-reorg: mode partition, gate off (window 60 DAA), joint 240 s, split 180 s, watch 150 s, honest 1 thread(s) each, attacker 3 (joint 1), expect reorg
+12:48:28.310 fg5 h1 up pid 480280 json 30892 p2p 30891
+12:48:29.828 fg5 h2 up pid 481840 json 30902 p2p 30901 addpeer 30921
+12:52:32.849 fg5 phase 1 done at 240.0 s: H1 245 blocks sink 58126c35 daa 244; H2 245 sink 58126c35; side 2 (h2) 245 sink 58126c35; keys H1 8da9ddee H2 undefined side2 eda9cde4
+12:52:32.909 fg5 weight at the fork (last 120 blue blocks of H1's chain): side 2 67, others 53, side 2 5583 bps
+12:52:34.922 fg5 links cut at 242.1 s; side 2 (h2) now mines with 3 thread(s), the honest side with 1 each
+12:55:35.025 fg5 phase 2 done at 422.2 s: H1 405 blocks sink a27a341c daa 404 blue 405 work 12270631; side 2 436 sink f9181a06 daa 435 blue 436 work 19576159 (side 2 heavier: true); fork depth 191 DAA against window 60
+12:55:35.026 fg5 links restored at 422.2 s; watching H1 for 150 s
+12:56:05.117 fg5 t=452.3 s H1 438 blocks sink a7ecf244 held; side 2 468 blocks sink cd8cfb42
+12:56:35.193 fg5 t=482.4 s H1 468 blocks sink 97b7a7a0 held; side 2 500 blocks sink a4045188
+12:57:00.247 fg5 H1 left its pre-cut chain at 507.4 s: sink afed1d222ea7304d by eda9cde4
+12:57:05.255 fg5 t=512.4 s H1 538 blocks sink 54deb845 REORGED; side 2 538 blocks sink 54deb845
+12:57:35.285 fg5 t=542.5 s H1 578 blocks sink 317e329b REORGED; side 2 578 blocks sink 317e329b
+12:58:05.313 fg5 t=572.5 s H1 605 blocks sink 1e585f80 REORGED; side 2 605 blocks sink 1e585f80
+12:58:05.317 fg5 SUMMARY PASS (partition-gate-off-expect-reorg): side 2 held 5583 bps of the blue blocks at the fork; fork depth 191 DAA against window 60; side 2 blue work 19576159 against H1 12270631 at the heal; H1 reorged at 507.4 s (0 refusal lines, knows side 2's tip: true); side 2 kept its chain: true
+12:58:05.318 fg5 summary: /srv/builds/igneum-wt-horizon/docs/plans/mission-item-4-gate/fork-gate-partition-gate-off-expect-reorg.json
diff --git a/docs/plans/mission-item-4-gate/fork-gate-partition-gate-on-expect-reorg.json b/docs/plans/mission-item-4-gate/fork-gate-partition-gate-on-expect-reorg.json
new file mode 100644
index 000000000..016c39fea
--- /dev/null
+++ b/docs/plans/mission-item-4-gate/fork-gate-partition-gate-on-expect-reorg.json
@@ -0,0 +1,653 @@
+{
+  "pass": true,
+  "expect": "reorg",
+  "case": "partition-gate-on-expect-reorg",
+  "mode": "partition",
+  "gate": "on",
+  "window": 60,
+  "joint": 240,
+  "split": 180,
+  "watch": 150,
+  "threads": {
+    "honest_each": 1,
+    "attacker_split": 3,
+    "attacker_joint": 1
+  },
+  "keys": {
+    "h1": "8da9ddee…",
+    "h2": null,
+    "side2": "eda9cde4…"
+  },
+  "share_at_fork": {
+    "side2": 45,
+    "others": 76,
+    "side2_bps": 3719
+  },
+  "fork_daa": 245,
+  "fork_depth_daa_at_heal": 194,
+  "sinks": {
+    "joint": {
+      "h1": {
+        "hash": "5c4cb584dc015892ddff89337412ed0883d9f97b4e791e7af2f7f64764f4f1e8",
+        "blocks": 246,
+        "daa": 245,
+        "blue": 246,
+        "blueWork": "8723556",
+        "key": "8da9ddee…"
+      },
+      "h2": {
+        "hash": "5c4cb584dc015892ddff89337412ed0883d9f97b4e791e7af2f7f64764f4f1e8",
+        "blocks": 246,
+        "daa": 245,
+        "blue": 246,
+        "blueWork": "8723556",
+        "key": "8da9ddee…"
+      },
+      "side2": {
+        "hash": "5c4cb584dc015892ddff89337412ed0883d9f97b4e791e7af2f7f64764f4f1e8",
+        "blocks": 246,
+        "daa": 245,
+        "blue": 246,
+        "blueWork": "8723556",
+        "key": "8da9ddee…"
+      }
+    },
+    "split": {
+      "h1": {
+        "hash": "753507c15705f4ea8ed19bc2697a11c489a052a45f28c64f9ac3d8400fa66647",
+        "blocks": 412,
+        "daa": 411,
+        "blue": 412,
+        "blueWork": "11490863",
+        "key": "8da9ddee…"
+      },
+      "h2": {
+        "hash": "32b7c1757fa288eed0a8ab709e49fd86f72be531db19c58e63d0aeca7a34c4f6",
+        "blocks": 440,
+        "daa": 439,
+        "blue": 440,
+        "blueWork": "18089683",
+        "key": "eda9cde4…"
+      },
+      "side2": {
+        "hash": "32b7c1757fa288eed0a8ab709e49fd86f72be531db19c58e63d0aeca7a34c4f6",
+        "blocks": 440,
+        "daa": 439,
+        "blue": 440,
+        "blueWork": "18089683",
+        "key": "eda9cde4…"
+      }
+    }
+  },
+  "per_node": {
+    "h1": {
+      "held": false,
+      "reorged": true,
+      "reorg_at_s": 507.4,
+      "knows_side2_tip": true,
+      "refusal_lines": 0
+    }
+  },
+  "checks": {
+    "side2_under_a_third_at_fork": false,
+    "fork_deeper_than_window": true,
+    "side2_heavier_at_heal": true,
+    "every_honest_node_learned_side2_chain": true,
+    "every_honest_node_held": false,
+    "every_honest_node_reorged": true,
+    "every_honest_node_logged_a_refusal": false,
+    "no_honest_node_logged_a_refusal": true,
+    "side2_kept_its_chain": true
+  },
+  "failed_checks": [],
+  "refusal_example": null,
+  "samples": [
+    {
+      "t": 427.2,
+      "h1": {
+        "blocks": 420,
+        "sink": "3c08068c8a93e490",
+        "daa": 419,
+        "blue": 420,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 443,
+        "sink": "5058df4580954747",
+        "blue": 443,
+        "reorged": false
+      }
+    },
+    {
+      "t": 432.2,
+      "h1": {
+        "blocks": 424,
+        "sink": "de896377901e94a8",
+        "daa": 423,
+        "blue": 424,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 455,
+        "sink": "a07d00aee9d3376d",
+        "blue": 455,
+        "reorged": false
+      }
+    },
+    {
+      "t": 437.2,
+      "h1": {
+        "blocks": 435,
+        "sink": "eaff2cb616a46c0e",
+        "daa": 434,
+        "blue": 435,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 461,
+        "sink": "4783198d038613db",
+        "blue": 461,
+        "reorged": false
+      }
+    },
+    {
+      "t": 442.2,
+      "h1": {
+        "blocks": 439,
+        "sink": "103fa3b3ea629ad7",
+        "daa": 438,
+        "blue": 439,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 465,
+        "sink": "91ba868ec4f84eef",
+        "blue": 465,
+        "reorged": false
+      }
+    },
+    {
+      "t": 447.3,
+      "h1": {
+        "blocks": 448,
+        "sink": "8437327aa78561ba",
+        "daa": 447,
+        "blue": 448,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 474,
+        "sink": "bb9ac90349a213e3",
+        "blue": 474,
+        "reorged": false
+      }
+    },
+    {
+      "t": 452.3,
+      "h1": {
+        "blocks": 450,
+        "sink": "03bd0f5a924e03ee",
+        "daa": 449,
+        "blue": 450,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 478,
+        "sink": "eca80f2c1a2106d5",
+        "blue": 478,
+        "reorged": false
+      }
+    },
+    {
+      "t": 457.3,
+      "h1": {
+        "blocks": 461,
+        "sink": "3fc505f8af71ea5f",
+        "daa": 460,
+        "blue": 461,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 481,
+        "sink": "017216a3976533dd",
+        "blue": 481,
+        "reorged": false
+      }
+    },
+    {
+      "t": 462.3,
+      "h1": {
+        "blocks": 463,
+        "sink": "a1b1d645d944446d",
+        "daa": 462,
+        "blue": 463,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 488,
+        "sink": "3ade2bb97b8e7548",
+        "blue": 488,
+        "reorged": false
+      }
+    },
+    {
+      "t": 467.3,
+      "h1": {
+        "blocks": 466,
+        "sink": "5b046e8c04baa74e",
+        "daa": 465,
+        "blue": 466,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 494,
+        "sink": "179ad98b8bcc4ea5",
+        "blue": 494,
+        "reorged": false
+      }
+    },
+    {
+      "t": 472.3,
+      "h1": {
+        "blocks": 470,
+        "sink": "aaf64f90ccac9c8a",
+        "daa": 469,
+        "blue": 470,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 498,
+        "sink": "1970740c1d9b0f6c",
+        "blue": 498,
+        "reorged": false
+      }
+    },
+    {
+      "t": 477.3,
+      "h1": {
+        "blocks": 473,
+        "sink": "b557fc4c16174c35",
+        "daa": 472,
+        "blue": 473,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 506,
+        "sink": "078df046b3a9953f",
+        "blue": 506,
+        "reorged": false
+      }
+    },
+    {
+      "t": 482.3,
+      "h1": {
+        "blocks": 480,
+        "sink": "7d7d5f6734e2c727",
+        "daa": 479,
+        "blue": 480,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 510,
+        "sink": "9e0f40b6766308e8",
+        "blue": 510,
+        "reorged": false
+      }
+    },
+    {
+      "t": 487.4,
+      "h1": {
+        "blocks": 485,
+        "sink": "6d3ff10f4556a1ca",
+        "daa": 484,
+        "blue": 485,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 512,
+        "sink": "aecf9f8ea6485764",
+        "blue": 512,
+        "reorged": false
+      }
+    },
+    {
+      "t": 492.4,
+      "h1": {
+        "blocks": 489,
+        "sink": "1196cd92a2989963",
+        "daa": 488,
+        "blue": 489,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 518,
+        "sink": "0a3a90068c2d74c0",
+        "blue": 518,
+        "reorged": false
+      }
+    },
+    {
+      "t": 497.4,
+      "h1": {
+        "blocks": 494,
+        "sink": "27ca83564fbe47ce",
+        "daa": 493,
+        "blue": 494,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 524,
+        "sink": "42b2b2dc9f1e4be2",
+        "blue": 524,
+        "reorged": false
+      }
+    },
+    {
+      "t": 502.4,
+      "h1": {
+        "blocks": 498,
+        "sink": "3f2c6e34b36b890e",
+        "daa": 497,
+        "blue": 498,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 531,
+        "sink": "d19320eebc86c66d",
+        "blue": 531,
+        "reorged": false
+      }
+    },
+    {
+      "t": 507.4,
+      "h1": {
+        "blocks": 535,
+        "sink": "126029df2f9caa4a",
+        "daa": 534,
+        "blue": 535,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 535,
+        "sink": "126029df2f9caa4a",
+        "blue": 535,
+        "reorged": false
+      }
+    },
+    {
+      "t": 512.4,
+      "h1": {
+        "blocks": 543,
+        "sink": "533898421902f564",
+        "daa": 542,
+        "blue": 543,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 543,
+        "sink": "533898421902f564",
+        "blue": 543,
+        "reorged": false
+      }
+    },
+    {
+      "t": 517.4,
+      "h1": {
+        "blocks": 546,
+        "sink": "85a43553233cf34b",
+        "daa": 545,
+        "blue": 546,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 546,
+        "sink": "85a43553233cf34b",
+        "blue": 546,
+        "reorged": false
+      }
+    },
+    {
+      "t": 522.4,
+      "h1": {
+        "blocks": 554,
+        "sink": "bed61271f9a8252d",
+        "daa": 553,
+        "blue": 554,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 554,
+        "sink": "bed61271f9a8252d",
+        "blue": 554,
+        "reorged": false
+      }
+    },
+    {
+      "t": 527.4,
+      "h1": {
+        "blocks": 560,
+        "sink": "9e91960a30057229",
+        "daa": 559,
+        "blue": 560,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 560,
+        "sink": "9e91960a30057229",
+        "blue": 560,
+        "reorged": false
+      }
+    },
+    {
+      "t": 532.4,
+      "h1": {
+        "blocks": 564,
+        "sink": "cd6d1240dc30d2e4",
+        "daa": 563,
+        "blue": 564,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 564,
+        "sink": "cd6d1240dc30d2e4",
+        "blue": 564,
+        "reorged": false
+      }
+    },
+    {
+      "t": 537.4,
+      "h1": {
+        "blocks": 570,
+        "sink": "0208b9cbd8adfa78",
+        "daa": 569,
+        "blue": 570,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 570,
+        "sink": "0208b9cbd8adfa78",
+        "blue": 570,
+        "reorged": false
+      }
+    },
+    {
+      "t": 542.4,
+      "h1": {
+        "blocks": 573,
+        "sink": "627692d65f09e879",
+        "daa": 572,
+        "blue": 573,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 573,
+        "sink": "627692d65f09e879",
+        "blue": 573,
+        "reorged": false
+      }
+    },
+    {
+      "t": 547.5,
+      "h1": {
+        "blocks": 576,
+        "sink": "84b34763f034804b",
+        "daa": 575,
+        "blue": 576,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 576,
+        "sink": "84b34763f034804b",
+        "blue": 576,
+        "reorged": false
+      }
+    },
+    {
+      "t": 552.5,
+      "h1": {
+        "blocks": 580,
+        "sink": "4ce7dce8da22296a",
+        "daa": 579,
+        "blue": 580,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 580,
+        "sink": "4ce7dce8da22296a",
+        "blue": 580,
+        "reorged": false
+      }
+    },
+    {
+      "t": 557.5,
+      "h1": {
+        "blocks": 585,
+        "sink": "f8c7fb1089532dde",
+        "daa": 584,
+        "blue": 585,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 585,
+        "sink": "f8c7fb1089532dde",
+        "blue": 585,
+        "reorged": false
+      }
+    },
+    {
+      "t": 562.5,
+      "h1": {
+        "blocks": 590,
+        "sink": "07d408946584e422",
+        "daa": 589,
+        "blue": 590,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 590,
+        "sink": "07d408946584e422",
+        "blue": 590,
+        "reorged": false
+      }
+    },
+    {
+      "t": 567.5,
+      "h1": {
+        "blocks": 598,
+        "sink": "3ffc006b66a221b9",
+        "daa": 597,
+        "blue": 598,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 598,
+        "sink": "3ffc006b66a221b9",
+        "blue": 598,
+        "reorged": false
+      }
+    },
+    {
+      "t": 572.5,
+      "h1": {
+        "blocks": 602,
+        "sink": "b3827232c44b06d2",
+        "daa": 601,
+        "blue": 602,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 602,
+        "sink": "b3827232c44b06d2",
+        "blue": 602,
+        "reorged": false
+      }
+    }
+  ],
+  "node": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneumd",
+  "miner": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneum-miner",
+  "slot": 4,
+  "ports": {
+    "base": 30850,
+    "suffix": 984
+  }
+}
diff --git a/docs/plans/mission-item-4-gate/fork-gate-partition-gate-on-expect-reorg.log b/docs/plans/mission-item-4-gate/fork-gate-partition-gate-on-expect-reorg.log
new file mode 100644
index 000000000..6f32860a5
--- /dev/null
+++ b/docs/plans/mission-item-4-gate/fork-gate-partition-gate-on-expect-reorg.log
@@ -0,0 +1,16 @@
+12:48:26.723 fg4 case partition-gate-on-expect-reorg: mode partition, gate on (window 60 DAA), joint 240 s, split 180 s, watch 150 s, honest 1 thread(s) each, attacker 3 (joint 1), expect reorg
+12:48:28.322 fg4 h1 up pid 480248 json 30852 p2p 30851
+12:48:29.844 fg4 h2 up pid 481994 json 30862 p2p 30861 addpeer 30881
+12:52:32.858 fg4 phase 1 done at 240.0 s: H1 246 blocks sink 5c4cb584 daa 245; H2 246 sink 5c4cb584; side 2 (h2) 246 sink 5c4cb584; keys H1 8da9ddee H2 undefined side2 eda9cde4
+12:52:32.918 fg4 weight at the fork (last 121 blue blocks of H1's chain): side 2 45, others 76, side 2 3719 bps
+12:52:34.929 fg4 links cut at 242.1 s; side 2 (h2) now mines with 3 thread(s), the honest side with 1 each
+12:55:35.033 fg4 phase 2 done at 422.2 s: H1 412 blocks sink 753507c1 daa 411 blue 412 work 11490863; side 2 440 sink 32b7c175 daa 439 blue 440 work 18089683 (side 2 heavier: true); fork depth 194 DAA against window 60
+12:55:35.035 fg4 links restored at 422.2 s; watching H1 for 150 s
+12:56:05.124 fg4 t=452.3 s H1 450 blocks sink 03bd0f5a held; side 2 478 blocks sink eca80f2c
+12:56:35.198 fg4 t=482.4 s H1 480 blocks sink 7d7d5f67 held; side 2 510 blocks sink 9e0f40b6
+12:57:00.246 fg4 H1 left its pre-cut chain at 507.4 s: sink 126029df2f9caa4a by eda9cde4
+12:57:05.255 fg4 t=512.4 s H1 543 blocks sink 53389842 REORGED; side 2 543 blocks sink 53389842
+12:57:35.298 fg4 t=542.5 s H1 573 blocks sink 627692d6 REORGED; side 2 573 blocks sink 627692d6
+12:58:05.330 fg4 t=572.5 s H1 602 blocks sink b3827232 REORGED; side 2 602 blocks sink b3827232
+12:58:05.334 fg4 SUMMARY PASS (partition-gate-on-expect-reorg): side 2 held 3719 bps of the blue blocks at the fork; fork depth 194 DAA against window 60; side 2 blue work 18089683 against H1 11490863 at the heal; H1 reorged at 507.4 s (0 refusal lines, knows side 2's tip: true); side 2 kept its chain: true
+12:58:05.334 fg4 summary: /srv/builds/igneum-wt-horizon/docs/plans/mission-item-4-gate/fork-gate-partition-gate-on-expect-reorg.json
diff --git a/docs/plans/mission-item-4-gate/fork-gate-third-gate-on-expect-reorg.json b/docs/plans/mission-item-4-gate/fork-gate-third-gate-on-expect-reorg.json
new file mode 100644
index 000000000..72840c797
--- /dev/null
+++ b/docs/plans/mission-item-4-gate/fork-gate-third-gate-on-expect-reorg.json
@@ -0,0 +1,930 @@
+{
+  "pass": true,
+  "expect": "reorg",
+  "case": "third-gate-on-expect-reorg",
+  "mode": "third",
+  "gate": "on",
+  "window": 60,
+  "joint": 240,
+  "split": 180,
+  "watch": 150,
+  "threads": {
+    "honest_each": 1,
+    "attacker_split": 3,
+    "attacker_joint": 2
+  },
+  "keys": {
+    "h1": "8da9ddee…",
+    "h2": "eda9cde4…",
+    "side2": "0e2c6fe2…"
+  },
+  "share_at_fork": {
+    "side2": 72,
+    "others": 48,
+    "side2_bps": 6000
+  },
+  "fork_daa": 268,
+  "fork_depth_daa_at_heal": 166,
+  "sinks": {
+    "joint": {
+      "h1": {
+        "hash": "037edd2a2976af7aec3f6b00d0532706f2c4bc48a2ace2d4e92f027492aa42af",
+        "blocks": 269,
+        "daa": 268,
+        "blue": 269,
+        "blueWork": "17483286",
+        "key": "0e2c6fe2…"
+      },
+      "h2": {
+        "hash": "037edd2a2976af7aec3f6b00d0532706f2c4bc48a2ace2d4e92f027492aa42af",
+        "blocks": 269,
+        "daa": 268,
+        "blue": 269,
+        "blueWork": "17483286",
+        "key": "0e2c6fe2…"
+      },
+      "side2": {
+        "hash": "037edd2a2976af7aec3f6b00d0532706f2c4bc48a2ace2d4e92f027492aa42af",
+        "blocks": 269,
+        "daa": 268,
+        "blue": 269,
+        "blueWork": "17483286",
+        "key": "0e2c6fe2…"
+      }
+    },
+    "split": {
+      "h1": {
+        "hash": "06f666ba3c449f2fab804e75612a00c748a8d56568806c30a7006aae175bb27d",
+        "blocks": 426,
+        "daa": 425,
+        "blue": 426,
+        "blueWork": "24628833",
+        "key": "8da9ddee…"
+      },
+      "h2": {
+        "hash": "06f666ba3c449f2fab804e75612a00c748a8d56568806c30a7006aae175bb27d",
+        "blocks": 426,
+        "daa": 425,
+        "blue": 426,
+        "blueWork": "24628833",
+        "key": "8da9ddee…"
+      },
+      "side2": {
+        "hash": "71396cf73521295ad0fbeb320de980989ea0788dbc859129d8972a9e091e0a3c",
+        "blocks": 435,
+        "daa": 434,
+        "blue": 435,
+        "blueWork": "28969222",
+        "key": "0e2c6fe2…"
+      }
+    }
+  },
+  "per_node": {
+    "h1": {
+      "held": false,
+      "reorged": true,
+      "reorg_at_s": 477.3,
+      "knows_side2_tip": true,
+      "refusal_lines": 0
+    },
+    "h2": {
+      "held": false,
+      "reorged": true,
+      "reorg_at_s": 477.3,
+      "knows_side2_tip": true,
+      "refusal_lines": 0
+    }
+  },
+  "checks": {
+    "side2_under_a_third_at_fork": false,
+    "fork_deeper_than_window": true,
+    "side2_heavier_at_heal": true,
+    "every_honest_node_learned_side2_chain": true,
+    "every_honest_node_held": false,
+    "every_honest_node_reorged": true,
+    "every_honest_node_logged_a_refusal": false,
+    "no_honest_node_logged_a_refusal": true,
+    "side2_kept_its_chain": true
+  },
+  "failed_checks": [],
+  "refusal_example": null,
+  "samples": [
+    {
+      "t": 427.2,
+      "h1": {
+        "blocks": 431,
+        "sink": "9a61020b8d49143a",
+        "daa": 430,
+        "blue": 431,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 431,
+        "sink": "9a61020b8d49143a",
+        "daa": 430,
+        "blue": 431,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 441,
+        "sink": "05e6f9d4ef677d31",
+        "blue": 441,
+        "reorged": false
+      }
+    },
+    {
+      "t": 432.2,
+      "h1": {
+        "blocks": 439,
+        "sink": "a4130e66a3d4a3df",
+        "daa": 438,
+        "blue": 439,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 439,
+        "sink": "a4130e66a3d4a3df",
+        "daa": 438,
+        "blue": 439,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 449,
+        "sink": "f7d08aee6cf90b41",
+        "blue": 449,
+        "reorged": false
+      }
+    },
+    {
+      "t": 437.2,
+      "h1": {
+        "blocks": 442,
+        "sink": "e1cc039c584559d7",
+        "daa": 441,
+        "blue": 442,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 442,
+        "sink": "e1cc039c584559d7",
+        "daa": 441,
+        "blue": 442,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 455,
+        "sink": "fa56a0ac4e5fb99c",
+        "blue": 455,
+        "reorged": false
+      }
+    },
+    {
+      "t": 442.2,
+      "h1": {
+        "blocks": 444,
+        "sink": "6904c2a75c7344fe",
+        "daa": 443,
+        "blue": 444,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 444,
+        "sink": "6904c2a75c7344fe",
+        "daa": 443,
+        "blue": 444,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 459,
+        "sink": "04b09f8a190c4051",
+        "blue": 459,
+        "reorged": false
+      }
+    },
+    {
+      "t": 447.2,
+      "h1": {
+        "blocks": 449,
+        "sink": "d55f8f3f03247788",
+        "daa": 448,
+        "blue": 449,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 449,
+        "sink": "d55f8f3f03247788",
+        "daa": 448,
+        "blue": 449,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 462,
+        "sink": "a6fa74e0833a3e0c",
+        "blue": 462,
+        "reorged": false
+      }
+    },
+    {
+      "t": 452.2,
+      "h1": {
+        "blocks": 454,
+        "sink": "feb2905b292ab9c7",
+        "daa": 453,
+        "blue": 454,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 454,
+        "sink": "feb2905b292ab9c7",
+        "daa": 453,
+        "blue": 454,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 464,
+        "sink": "093014496d558f65",
+        "blue": 464,
+        "reorged": false
+      }
+    },
+    {
+      "t": 457.3,
+      "h1": {
+        "blocks": 462,
+        "sink": "b10ed98591f50ec6",
+        "daa": 461,
+        "blue": 462,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 462,
+        "sink": "b10ed98591f50ec6",
+        "daa": 461,
+        "blue": 462,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 469,
+        "sink": "7a00df10d8b78e18",
+        "blue": 469,
+        "reorged": false
+      }
+    },
+    {
+      "t": 462.3,
+      "h1": {
+        "blocks": 467,
+        "sink": "ebf8c4bd560f2ccf",
+        "daa": 466,
+        "blue": 467,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 467,
+        "sink": "ebf8c4bd560f2ccf",
+        "daa": 466,
+        "blue": 467,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 474,
+        "sink": "ade976380c06a8d8",
+        "blue": 474,
+        "reorged": false
+      }
+    },
+    {
+      "t": 467.3,
+      "h1": {
+        "blocks": 471,
+        "sink": "311bf74ecfb1cb33",
+        "daa": 470,
+        "blue": 471,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 471,
+        "sink": "311bf74ecfb1cb33",
+        "daa": 470,
+        "blue": 471,
+        "key": "8da9ddee",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 482,
+        "sink": "a1dc4abe41431122",
+        "blue": 482,
+        "reorged": false
+      }
+    },
+    {
+      "t": 472.3,
+      "h1": {
+        "blocks": 476,
+        "sink": "0fc8726976801d2b",
+        "daa": 475,
+        "blue": 476,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "h2": {
+        "blocks": 476,
+        "sink": "0fc8726976801d2b",
+        "daa": 475,
+        "blue": 476,
+        "key": "eda9cde4",
+        "reorged": false,
+        "knows_side2_tip": false
+      },
+      "side2": {
+        "blocks": 487,
+        "sink": "c2c737c0d473f009",
+        "blue": 487,
+        "reorged": false
+      }
+    },
+    {
+      "t": 477.3,
+      "h1": {
+        "blocks": 492,
+        "sink": "df2ecca49796b69c",
+        "daa": 491,
+        "blue": 492,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 492,
+        "sink": "df2ecca49796b69c",
+        "daa": 491,
+        "blue": 492,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 492,
+        "sink": "df2ecca49796b69c",
+        "blue": 492,
+        "reorged": false
+      }
+    },
+    {
+      "t": 482.3,
+      "h1": {
+        "blocks": 498,
+        "sink": "33ab64dbbd41433e",
+        "daa": 497,
+        "blue": 498,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 498,
+        "sink": "33ab64dbbd41433e",
+        "daa": 497,
+        "blue": 498,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 498,
+        "sink": "33ab64dbbd41433e",
+        "blue": 498,
+        "reorged": false
+      }
+    },
+    {
+      "t": 487.3,
+      "h1": {
+        "blocks": 506,
+        "sink": "4fa4f31a124990c1",
+        "daa": 505,
+        "blue": 506,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 506,
+        "sink": "4fa4f31a124990c1",
+        "daa": 505,
+        "blue": 506,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 506,
+        "sink": "4fa4f31a124990c1",
+        "blue": 506,
+        "reorged": false
+      }
+    },
+    {
+      "t": 492.3,
+      "h1": {
+        "blocks": 510,
+        "sink": "4121ec5f7e04b3a2",
+        "daa": 509,
+        "blue": 510,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 510,
+        "sink": "4121ec5f7e04b3a2",
+        "daa": 509,
+        "blue": 510,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 510,
+        "sink": "4121ec5f7e04b3a2",
+        "blue": 510,
+        "reorged": false
+      }
+    },
+    {
+      "t": 497.3,
+      "h1": {
+        "blocks": 518,
+        "sink": "217d584ac3d48f32",
+        "daa": 517,
+        "blue": 518,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 518,
+        "sink": "217d584ac3d48f32",
+        "daa": 517,
+        "blue": 518,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 518,
+        "sink": "217d584ac3d48f32",
+        "blue": 518,
+        "reorged": false
+      }
+    },
+    {
+      "t": 502.3,
+      "h1": {
+        "blocks": 527,
+        "sink": "d14ed2e5f11c7df7",
+        "daa": 526,
+        "blue": 527,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 527,
+        "sink": "d14ed2e5f11c7df7",
+        "daa": 526,
+        "blue": 527,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 527,
+        "sink": "d14ed2e5f11c7df7",
+        "blue": 527,
+        "reorged": false
+      }
+    },
+    {
+      "t": 507.3,
+      "h1": {
+        "blocks": 533,
+        "sink": "23cf4405d058110e",
+        "daa": 532,
+        "blue": 533,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 533,
+        "sink": "23cf4405d058110e",
+        "daa": 532,
+        "blue": 533,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 533,
+        "sink": "23cf4405d058110e",
+        "blue": 533,
+        "reorged": false
+      }
+    },
+    {
+      "t": 512.4,
+      "h1": {
+        "blocks": 537,
+        "sink": "ec6ff75c8617a6c0",
+        "daa": 535,
+        "blue": 536,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 537,
+        "sink": "ec6ff75c8617a6c0",
+        "daa": 535,
+        "blue": 536,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 537,
+        "sink": "ec6ff75c8617a6c0",
+        "blue": 536,
+        "reorged": false
+      }
+    },
+    {
+      "t": 517.4,
+      "h1": {
+        "blocks": 542,
+        "sink": "53152f1d8342a7ba",
+        "daa": 541,
+        "blue": 542,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 542,
+        "sink": "53152f1d8342a7ba",
+        "daa": 541,
+        "blue": 542,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 542,
+        "sink": "53152f1d8342a7ba",
+        "blue": 542,
+        "reorged": false
+      }
+    },
+    {
+      "t": 522.4,
+      "h1": {
+        "blocks": 548,
+        "sink": "1425827f8f967320",
+        "daa": 547,
+        "blue": 548,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 548,
+        "sink": "1425827f8f967320",
+        "daa": 547,
+        "blue": 548,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 548,
+        "sink": "1425827f8f967320",
+        "blue": 548,
+        "reorged": false
+      }
+    },
+    {
+      "t": 527.4,
+      "h1": {
+        "blocks": 554,
+        "sink": "12bc21c9e6549a42",
+        "daa": 553,
+        "blue": 554,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 554,
+        "sink": "12bc21c9e6549a42",
+        "daa": 553,
+        "blue": 554,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 554,
+        "sink": "12bc21c9e6549a42",
+        "blue": 554,
+        "reorged": false
+      }
+    },
+    {
+      "t": 532.4,
+      "h1": {
+        "blocks": 559,
+        "sink": "b17be188847a071b",
+        "daa": 558,
+        "blue": 559,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 559,
+        "sink": "b17be188847a071b",
+        "daa": 558,
+        "blue": 559,
+        "key": "8da9ddee",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 559,
+        "sink": "b17be188847a071b",
+        "blue": 559,
+        "reorged": false
+      }
+    },
+    {
+      "t": 537.4,
+      "h1": {
+        "blocks": 564,
+        "sink": "bcf3066ae7329fb1",
+        "daa": 563,
+        "blue": 564,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 564,
+        "sink": "bcf3066ae7329fb1",
+        "daa": 563,
+        "blue": 564,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 564,
+        "sink": "bcf3066ae7329fb1",
+        "blue": 564,
+        "reorged": false
+      }
+    },
+    {
+      "t": 542.4,
+      "h1": {
+        "blocks": 571,
+        "sink": "3c8486f382c004a4",
+        "daa": 570,
+        "blue": 571,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 571,
+        "sink": "3c8486f382c004a4",
+        "daa": 570,
+        "blue": 571,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 571,
+        "sink": "3c8486f382c004a4",
+        "blue": 571,
+        "reorged": false
+      }
+    },
+    {
+      "t": 547.4,
+      "h1": {
+        "blocks": 573,
+        "sink": "55eb5bc461792e81",
+        "daa": 572,
+        "blue": 573,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 573,
+        "sink": "55eb5bc461792e81",
+        "daa": 572,
+        "blue": 573,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 573,
+        "sink": "55eb5bc461792e81",
+        "blue": 573,
+        "reorged": false
+      }
+    },
+    {
+      "t": 552.4,
+      "h1": {
+        "blocks": 577,
+        "sink": "c5812db6a85bdadb",
+        "daa": 576,
+        "blue": 577,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 577,
+        "sink": "c5812db6a85bdadb",
+        "daa": 576,
+        "blue": 577,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 577,
+        "sink": "c5812db6a85bdadb",
+        "blue": 577,
+        "reorged": false
+      }
+    },
+    {
+      "t": 557.4,
+      "h1": {
+        "blocks": 579,
+        "sink": "a43cb662dec21b79",
+        "daa": 578,
+        "blue": 579,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 579,
+        "sink": "a43cb662dec21b79",
+        "daa": 578,
+        "blue": 579,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 579,
+        "sink": "a43cb662dec21b79",
+        "blue": 579,
+        "reorged": false
+      }
+    },
+    {
+      "t": 562.4,
+      "h1": {
+        "blocks": 586,
+        "sink": "a5490f8482cfcac1",
+        "daa": 585,
+        "blue": 586,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 586,
+        "sink": "a5490f8482cfcac1",
+        "daa": 585,
+        "blue": 586,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 586,
+        "sink": "a5490f8482cfcac1",
+        "blue": 586,
+        "reorged": false
+      }
+    },
+    {
+      "t": 567.5,
+      "h1": {
+        "blocks": 590,
+        "sink": "85ff280e3c193276",
+        "daa": 589,
+        "blue": 590,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 590,
+        "sink": "85ff280e3c193276",
+        "daa": 589,
+        "blue": 590,
+        "key": "eda9cde4",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 590,
+        "sink": "85ff280e3c193276",
+        "blue": 590,
+        "reorged": false
+      }
+    },
+    {
+      "t": 572.5,
+      "h1": {
+        "blocks": 591,
+        "sink": "eb3dbbc60e30ebba",
+        "daa": 590,
+        "blue": 591,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "h2": {
+        "blocks": 591,
+        "sink": "eb3dbbc60e30ebba",
+        "daa": 590,
+        "blue": 591,
+        "key": "0e2c6fe2",
+        "reorged": true,
+        "knows_side2_tip": true
+      },
+      "side2": {
+        "blocks": 591,
+        "sink": "eb3dbbc60e30ebba",
+        "blue": 591,
+        "reorged": false
+      }
+    }
+  ],
+  "node": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneumd",
+  "miner": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneum-miner",
+  "slot": 3,
+  "ports": {
+    "base": 30810,
+    "suffix": 983
+  }
+}
diff --git a/docs/plans/mission-item-4-gate/fork-gate-third-gate-on-expect-reorg.log b/docs/plans/mission-item-4-gate/fork-gate-third-gate-on-expect-reorg.log
new file mode 100644
index 000000000..72eac7f7f
--- /dev/null
+++ b/docs/plans/mission-item-4-gate/fork-gate-third-gate-on-expect-reorg.log
@@ -0,0 +1,18 @@
+12:48:26.802 fg3 case third-gate-on-expect-reorg: mode third, gate on (window 60 DAA), joint 240 s, split 180 s, watch 150 s, honest 1 thread(s) each, attacker 3 (joint 2), expect reorg
+12:48:28.386 fg3 h1 up pid 480989 json 30812 p2p 30811
+12:48:29.896 fg3 h2 up pid 482351 json 30822 p2p 30821 addpeer 30811
+12:48:31.410 fg3 b up pid 483327 json 30832 p2p 30831 addpeer 30841,30842
+12:52:34.426 fg3 phase 1 done at 240.0 s: H1 269 blocks sink 037edd2a daa 268; H2 269 sink 037edd2a; side 2 (b) 269 sink 037edd2a; keys H1 8da9ddee H2 eda9cde4 side2 0e2c6fe2
+12:52:34.451 fg3 weight at the fork (last 120 blue blocks of H1's chain): side 2 72, others 48, side 2 6000 bps
+12:52:36.465 fg3 links cut at 242.1 s; side 2 (b) now mines with 3 thread(s), the honest side with 1 each
+12:55:36.572 fg3 phase 2 done at 422.2 s: H1 426 blocks sink 06f666ba daa 425 blue 426 work 24628833; side 2 435 sink 71396cf7 daa 434 blue 435 work 28969222 (side 2 heavier: true); fork depth 166 DAA against window 60
+12:55:36.573 fg3 links restored at 422.2 s; watching H1 and H2 for 150 s
+12:56:06.662 fg3 t=452.2 s H1 454 blocks sink feb2905b held; H2 454 blocks sink feb2905b held; side 2 464 blocks sink 09301449
+12:56:31.716 fg3 H1 left its pre-cut chain at 477.3 s: sink df2ecca49796b69c by 0e2c6fe2
+12:56:31.720 fg3 H2 left its pre-cut chain at 477.3 s: sink df2ecca49796b69c by 0e2c6fe2
+12:56:36.729 fg3 t=482.3 s H1 498 blocks sink 33ab64db REORGED; H2 498 blocks sink 33ab64db REORGED; side 2 498 blocks sink 33ab64db
+12:57:06.776 fg3 t=512.4 s H1 537 blocks sink ec6ff75c REORGED; H2 537 blocks sink ec6ff75c REORGED; side 2 537 blocks sink ec6ff75c
+12:57:36.826 fg3 t=542.4 s H1 571 blocks sink 3c8486f3 REORGED; H2 571 blocks sink 3c8486f3 REORGED; side 2 571 blocks sink 3c8486f3
+12:58:06.880 fg3 t=572.5 s H1 591 blocks sink eb3dbbc6 REORGED; H2 591 blocks sink eb3dbbc6 REORGED; side 2 591 blocks sink eb3dbbc6
+12:58:06.890 fg3 SUMMARY PASS (third-gate-on-expect-reorg): side 2 held 6000 bps of the blue blocks at the fork; fork depth 166 DAA against window 60; side 2 blue work 28969222 against H1 24628833 at the heal; H1 reorged at 477.3 s (0 refusal lines, knows side 2's tip: true); H2 reorged at 477.3 s (0 refusal lines, knows side 2's tip: true); side 2 kept its chain: true
+12:58:06.890 fg3 summary: /srv/builds/igneum-wt-horizon/docs/plans/mission-item-4-gate/fork-gate-third-gate-on-expect-reorg.json
diff --git a/docs/plans/mission-item-4-gate/summary.json b/docs/plans/mission-item-4-gate/summary.json
new file mode 100644
index 000000000..3ee33a51e
--- /dev/null
+++ b/docs/plans/mission-item-4-gate/summary.json
@@ -0,0 +1,796 @@
+{
+  "green": true,
+  "at": "2026-10-07T12:58:08.407Z",
+  "heal_unchanged": true,
+  "node": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneumd",
+  "miner": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneum-miner",
+  "cases": [
+    {
+      "mode": "attack",
+      "gate": "off",
+      "expect": "reorg",
+      "must": "PASS",
+      "line": "the rule's known-failed case: without the gate a fresh key's heavier deep fork wins on every honest node",
+      "slot": 0,
+      "name": "attack-gate-off-expect-reorg",
+      "verdict": "PASS",
+      "as_it_must": true,
+      "secs": 581,
+      "exit": 0,
+      "summary_line": "SUMMARY PASS (attack-gate-off-expect-reorg): side 2 held 0 bps of the blue blocks at the fork; fork depth 191 DAA against window 60; side 2 blue work 17470131 against H1 14893198 at the heal; H1 reorged at 510.4 s (0 refusal lines, knows side 2's tip: true); H2 reorged at 510.4 s (0 refusal lines, knows side 2's tip: true); side 2 kept its chain: true",
+      "summary": {
+        "pass": true,
+        "expect": "reorg",
+        "case": "attack-gate-off-expect-reorg",
+        "mode": "attack",
+        "gate": "off",
+        "window": 60,
+        "joint": 240,
+        "split": 180,
+        "watch": 150,
+        "threads": {
+          "honest_each": 1,
+          "attacker_split": 3,
+          "attacker_joint": 0
+        },
+        "keys": {
+          "h1": "8da9ddee…",
+          "h2": "eda9cde4…",
+          "side2": "0e2c6fe2…"
+        },
+        "share_at_fork": {
+          "side2": 0,
+          "others": 120,
+          "side2_bps": 0
+        },
+        "fork_daa": 240,
+        "fork_depth_daa_at_heal": 191,
+        "sinks": {
+          "joint": {
+            "h1": {
+              "hash": "e66998c63f8f5d2f3f9108a5c61730f3d5ee06a0553f47e3bce314a0e4d7228e",
+              "blocks": 242,
+              "daa": 240,
+              "blue": 241,
+              "blueWork": "8689541",
+              "key": "8da9ddee…"
+            },
+            "h2": {
+              "hash": "e66998c63f8f5d2f3f9108a5c61730f3d5ee06a0553f47e3bce314a0e4d7228e",
+              "blocks": 242,
+              "daa": 240,
+              "blue": 241,
+              "blueWork": "8689541",
+              "key": "8da9ddee…"
+            },
+            "side2": {
+              "hash": "e66998c63f8f5d2f3f9108a5c61730f3d5ee06a0553f47e3bce314a0e4d7228e",
+              "blocks": 242,
+              "daa": 240,
+              "blue": 241,
+              "blueWork": "8689541",
+              "key": "8da9ddee…"
+            }
+          },
+          "split": {
+            "h1": {
+              "hash": "6e932c389f2ad01a39873317f9549f0a336e66a7c840669dd5bcb44a979a19ad",
+              "blocks": 421,
+              "daa": 420,
+              "blue": 421,
+              "blueWork": "14893198",
+              "key": "8da9ddee…"
+            },
+            "h2": {
+              "hash": "6e932c389f2ad01a39873317f9549f0a336e66a7c840669dd5bcb44a979a19ad",
+              "blocks": 421,
+              "daa": 420,
+              "blue": 421,
+              "blueWork": "14893198",
+              "key": "8da9ddee…"
+            },
+            "side2": {
+              "hash": "d93a1238a397f68337f4bc28d6197a61a32fbca176f3e7f4248b6b330e239cc8",
+              "blocks": 432,
+              "daa": 431,
+              "blue": 432,
+              "blueWork": "17470131",
+              "key": "0e2c6fe2…"
+            }
+          }
+        },
+        "per_node": {
+          "h1": {
+            "held": false,
+            "reorged": true,
+            "reorg_at_s": 510.4,
+            "knows_side2_tip": true,
+            "refusal_lines": 0
+          },
+          "h2": {
+            "held": false,
+            "reorged": true,
+            "reorg_at_s": 510.4,
+            "knows_side2_tip": true,
+            "refusal_lines": 0
+          }
+        },
+        "checks": {
+          "side2_under_a_third_at_fork": true,
+          "fork_deeper_than_window": true,
+          "side2_heavier_at_heal": true,
+          "every_honest_node_learned_side2_chain": true,
+          "every_honest_node_held": false,
+          "every_honest_node_reorged": true,
+          "every_honest_node_logged_a_refusal": false,
+          "no_honest_node_logged_a_refusal": true,
+          "side2_kept_its_chain": true
+        },
+        "failed_checks": [],
+        "refusal_example": null,
+        "node": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneumd",
+        "miner": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneum-miner",
+        "slot": 0,
+        "ports": {
+          "base": 30690,
+          "suffix": 980
+        }
+      },
+      "log": "/srv/builds/igneum-wt-horizon/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-reorg.log"
+    },
+    {
+      "mode": "attack",
+      "gate": "off",
+      "expect": "hold",
+      "must": "FAIL",
+      "line": "the harness's own failed shape: with the gate off it must not report a hold",
+      "slot": 1,
+      "name": "attack-gate-off-expect-hold",
+      "verdict": "FAIL",
+      "as_it_must": true,
+      "secs": 581,
+      "exit": 1,
+      "summary_line": "SUMMARY FAIL (attack-gate-off-expect-hold): side 2 held 0 bps of the blue blocks at the fork; fork depth 179 DAA against window 60; side 2 blue work 19683187 against H1 17459678 at the heal; H1 reorged at 480.3 s (0 refusal lines, knows side 2's tip: true); H2 reorged at 480.3 s (0 refusal lines, knows side 2's tip: true); side 2 kept its chain: true; FAILED CHECK every_honest_node_held, every_honest_node_logged_a_refusal",
+      "summary": {
+        "pass": false,
+        "expect": "hold",
+        "case": "attack-gate-off-expect-hold",
+        "mode": "attack",
+        "gate": "off",
+        "window": 60,
+        "joint": 240,
+        "split": 180,
+        "watch": 150,
+        "threads": {
+          "honest_each": 1,
+          "attacker_split": 3,
+          "attacker_joint": 0
+        },
+        "keys": {
+          "h1": "8da9ddee…",
+          "h2": "eda9cde4…",
+          "side2": "0e2c6fe2…"
+        },
+        "share_at_fork": {
+          "side2": 0,
+          "others": 120,
+          "side2_bps": 0
+        },
+        "fork_daa": 247,
+        "fork_depth_daa_at_heal": 179,
+        "sinks": {
+          "joint": {
+            "h1": {
+              "hash": "0535d8ae67287238ee528bae5ab1f366273bd1c65c6a94342ec3879a40b81c88",
+              "blocks": 248,
+              "daa": 247,
+              "blue": 248,
+              "blueWork": "11209205",
+              "key": "8da9ddee…"
+            },
+            "h2": {
+              "hash": "0535d8ae67287238ee528bae5ab1f366273bd1c65c6a94342ec3879a40b81c88",
+              "blocks": 248,
+              "daa": 247,
+              "blue": 248,
+              "blueWork": "11209205",
+              "key": "8da9ddee…"
+            },
+            "side2": {
+              "hash": "0535d8ae67287238ee528bae5ab1f366273bd1c65c6a94342ec3879a40b81c88",
+              "blocks": 248,
+              "daa": 247,
+              "blue": 248,
+              "blueWork": "11209205",
+              "key": "8da9ddee…"
+            }
+          },
+          "split": {
+            "h1": {
+              "hash": "d5347d2cd3468901fda8e5a1caffe0be55d45eb12739577fadb0141d2291c2ba",
+              "blocks": 412,
+              "daa": 411,
+              "blue": 412,
+              "blueWork": "17459678",
+              "key": "8da9ddee…"
+            },
+            "h2": {
+              "hash": "d5347d2cd3468901fda8e5a1caffe0be55d45eb12739577fadb0141d2291c2ba",
+              "blocks": 412,
+              "daa": 411,
+              "blue": 412,
+              "blueWork": "17459678",
+              "key": "8da9ddee…"
+            },
+            "side2": {
+              "hash": "bfdb75e384417228a85f4098f8f2bb65d40c271ce674bea2d1cc8a3c6c335f53",
+              "blocks": 427,
+              "daa": 426,
+              "blue": 427,
+              "blueWork": "19683187",
+              "key": "0e2c6fe2…"
+            }
+          }
+        },
+        "per_node": {
+          "h1": {
+            "held": false,
+            "reorged": true,
+            "reorg_at_s": 480.3,
+            "knows_side2_tip": true,
+            "refusal_lines": 0
+          },
+          "h2": {
+            "held": false,
+            "reorged": true,
+            "reorg_at_s": 480.3,
+            "knows_side2_tip": true,
+            "refusal_lines": 0
+          }
+        },
+        "checks": {
+          "side2_under_a_third_at_fork": true,
+          "fork_deeper_than_window": true,
+          "side2_heavier_at_heal": true,
+          "every_honest_node_learned_side2_chain": true,
+          "every_honest_node_held": false,
+          "every_honest_node_reorged": true,
+          "every_honest_node_logged_a_refusal": false,
+          "no_honest_node_logged_a_refusal": true,
+          "side2_kept_its_chain": true
+        },
+        "failed_checks": [
+          "every_honest_node_held",
+          "every_honest_node_logged_a_refusal"
+        ],
+        "refusal_example": null,
+        "node": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneumd",
+        "miner": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneum-miner",
+        "slot": 1,
+        "ports": {
+          "base": 30730,
+          "suffix": 981
+        }
+      },
+      "log": "/srv/builds/igneum-wt-horizon/docs/plans/mission-item-4-gate/fork-gate-attack-gate-off-expect-hold.log"
+    },
+    {
+      "mode": "attack",
+      "gate": "on",
+      "expect": "hold",
+      "must": "PASS",
+      "line": "the gate line: a fresh-key fork from three windows back, heavier by blue work, refused by every honest node",
+      "slot": 2,
+      "name": "attack-gate-on-expect-hold",
+      "verdict": "PASS",
+      "as_it_must": true,
+      "secs": 581,
+      "exit": 0,
+      "summary_line": "SUMMARY PASS (attack-gate-on-expect-hold): side 2 held 0 bps of the blue blocks at the fork; fork depth 197 DAA against window 60; side 2 blue work 20297242 against H1 14807915 at the heal; H1 held (177 refusal lines, knows side 2's tip: true); H2 held (177 refusal lines, knows side 2's tip: true); side 2 kept its chain: true",
+      "summary": {
+        "pass": true,
+        "expect": "hold",
+        "case": "attack-gate-on-expect-hold",
+        "mode": "attack",
+        "gate": "on",
+        "window": 60,
+        "joint": 240,
+        "split": 180,
+        "watch": 150,
+        "threads": {
+          "honest_each": 1,
+          "attacker_split": 3,
+          "attacker_joint": 0
+        },
+        "keys": {
+          "h1": "8da9ddee…",
+          "h2": "eda9cde4…",
+          "side2": "0e2c6fe2…"
+        },
+        "share_at_fork": {
+          "side2": 0,
+          "others": 121,
+          "side2_bps": 0
+        },
+        "fork_daa": 233,
+        "fork_depth_daa_at_heal": 197,
+        "sinks": {
+          "joint": {
+            "h1": {
+              "hash": "7ed68743f22e711490406bd380cf66fff94579fcc981344c317a46c18cbc61bb",
+              "blocks": 234,
+              "daa": 233,
+              "blue": 234,
+              "blueWork": "8862250",
+              "key": "eda9cde4…"
+            },
+            "h2": {
+              "hash": "7ed68743f22e711490406bd380cf66fff94579fcc981344c317a46c18cbc61bb",
+              "blocks": 234,
+              "daa": 233,
+              "blue": 234,
+              "blueWork": "8862250",
+              "key": "eda9cde4…"
+            },
+            "side2": {
+              "hash": "7ed68743f22e711490406bd380cf66fff94579fcc981344c317a46c18cbc61bb",
+              "blocks": 234,
+              "daa": 233,
+              "blue": 234,
+              "blueWork": "8862250",
+              "key": "eda9cde4…"
+            }
+          },
+          "split": {
+            "h1": {
+              "hash": "036cfe568f3d403351b338ea41b7069ad4eae0ce95308436a25b6c7aa4c1372a",
+              "blocks": 396,
+              "daa": 395,
+              "blue": 396,
+              "blueWork": "14807915",
+              "key": "8da9ddee…"
+            },
+            "h2": {
+              "hash": "036cfe568f3d403351b338ea41b7069ad4eae0ce95308436a25b6c7aa4c1372a",
+              "blocks": 396,
+              "daa": 395,
+              "blue": 396,
+              "blueWork": "14807915",
+              "key": "8da9ddee…"
+            },
+            "side2": {
+              "hash": "abb93c2318f6c2ebdbd4e14a50b3d73ba7f483b8b06b18666e1015d038d4011a",
+              "blocks": 431,
+              "daa": 430,
+              "blue": 431,
+              "blueWork": "20297242",
+              "key": "0e2c6fe2…"
+            }
+          }
+        },
+        "per_node": {
+          "h1": {
+            "held": true,
+            "reorged": false,
+            "reorg_at_s": null,
+            "knows_side2_tip": true,
+            "refusal_lines": 177
+          },
+          "h2": {
+            "held": true,
+            "reorged": false,
+            "reorg_at_s": null,
+            "knows_side2_tip": true,
+            "refusal_lines": 177
+          }
+        },
+        "checks": {
+          "side2_under_a_third_at_fork": true,
+          "fork_deeper_than_window": true,
+          "side2_heavier_at_heal": true,
+          "every_honest_node_learned_side2_chain": true,
+          "every_honest_node_held": true,
+          "every_honest_node_reorged": false,
+          "every_honest_node_logged_a_refusal": true,
+          "no_honest_node_logged_a_refusal": false,
+          "side2_kept_its_chain": true
+        },
+        "failed_checks": [],
+        "refusal_example": "Fork choice: block 41225a00fb38b6394540a5707443bd70e678484cbd20aa3fa8e807bb24df8d4a forks 252 DAA back from the sink's chain and its builders hold 0.00% of the weight table at the fork (under one third); not a sink candidate (ledger 51-percent rank 2)",
+        "node": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneumd",
+        "miner": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneum-miner",
+        "slot": 2,
+        "ports": {
+          "base": 30770,
+          "suffix": 982
+        }
+      },
+      "log": "/srv/builds/igneum-wt-horizon/docs/plans/mission-item-4-gate/fork-gate-attack-gate-on-expect-hold.log"
+    },
+    {
+      "mode": "third",
+      "gate": "on",
+      "expect": "reorg",
+      "must": "PASS",
+      "line": "a fork whose builder holds at least a third of the table at the fork is accepted",
+      "slot": 3,
+      "name": "third-gate-on-expect-reorg",
+      "verdict": "PASS",
+      "as_it_must": true,
+      "secs": 583,
+      "exit": 0,
+      "summary_line": "SUMMARY PASS (third-gate-on-expect-reorg): side 2 held 6000 bps of the blue blocks at the fork; fork depth 166 DAA against window 60; side 2 blue work 28969222 against H1 24628833 at the heal; H1 reorged at 477.3 s (0 refusal lines, knows side 2's tip: true); H2 reorged at 477.3 s (0 refusal lines, knows side 2's tip: true); side 2 kept its chain: true",
+      "summary": {
+        "pass": true,
+        "expect": "reorg",
+        "case": "third-gate-on-expect-reorg",
+        "mode": "third",
+        "gate": "on",
+        "window": 60,
+        "joint": 240,
+        "split": 180,
+        "watch": 150,
+        "threads": {
+          "honest_each": 1,
+          "attacker_split": 3,
+          "attacker_joint": 2
+        },
+        "keys": {
+          "h1": "8da9ddee…",
+          "h2": "eda9cde4…",
+          "side2": "0e2c6fe2…"
+        },
+        "share_at_fork": {
+          "side2": 72,
+          "others": 48,
+          "side2_bps": 6000
+        },
+        "fork_daa": 268,
+        "fork_depth_daa_at_heal": 166,
+        "sinks": {
+          "joint": {
+            "h1": {
+              "hash": "037edd2a2976af7aec3f6b00d0532706f2c4bc48a2ace2d4e92f027492aa42af",
+              "blocks": 269,
+              "daa": 268,
+              "blue": 269,
+              "blueWork": "17483286",
+              "key": "0e2c6fe2…"
+            },
+            "h2": {
+              "hash": "037edd2a2976af7aec3f6b00d0532706f2c4bc48a2ace2d4e92f027492aa42af",
+              "blocks": 269,
+              "daa": 268,
+              "blue": 269,
+              "blueWork": "17483286",
+              "key": "0e2c6fe2…"
+            },
+            "side2": {
+              "hash": "037edd2a2976af7aec3f6b00d0532706f2c4bc48a2ace2d4e92f027492aa42af",
+              "blocks": 269,
+              "daa": 268,
+              "blue": 269,
+              "blueWork": "17483286",
+              "key": "0e2c6fe2…"
+            }
+          },
+          "split": {
+            "h1": {
+              "hash": "06f666ba3c449f2fab804e75612a00c748a8d56568806c30a7006aae175bb27d",
+              "blocks": 426,
+              "daa": 425,
+              "blue": 426,
+              "blueWork": "24628833",
+              "key": "8da9ddee…"
+            },
+            "h2": {
+              "hash": "06f666ba3c449f2fab804e75612a00c748a8d56568806c30a7006aae175bb27d",
+              "blocks": 426,
+              "daa": 425,
+              "blue": 426,
+              "blueWork": "24628833",
+              "key": "8da9ddee…"
+            },
+            "side2": {
+              "hash": "71396cf73521295ad0fbeb320de980989ea0788dbc859129d8972a9e091e0a3c",
+              "blocks": 435,
+              "daa": 434,
+              "blue": 435,
+              "blueWork": "28969222",
+              "key": "0e2c6fe2…"
+            }
+          }
+        },
+        "per_node": {
+          "h1": {
+            "held": false,
+            "reorged": true,
+            "reorg_at_s": 477.3,
+            "knows_side2_tip": true,
+            "refusal_lines": 0
+          },
+          "h2": {
+            "held": false,
+            "reorged": true,
+            "reorg_at_s": 477.3,
+            "knows_side2_tip": true,
+            "refusal_lines": 0
+          }
+        },
+        "checks": {
+          "side2_under_a_third_at_fork": false,
+          "fork_deeper_than_window": true,
+          "side2_heavier_at_heal": true,
+          "every_honest_node_learned_side2_chain": true,
+          "every_honest_node_held": false,
+          "every_honest_node_reorged": true,
+          "every_honest_node_logged_a_refusal": false,
+          "no_honest_node_logged_a_refusal": true,
+          "side2_kept_its_chain": true
+        },
+        "failed_checks": [],
+        "refusal_example": null,
+        "node": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneumd",
+        "miner": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneum-miner",
+        "slot": 3,
+        "ports": {
+          "base": 30810,
+          "suffix": 983
+        }
+      },
+      "log": "/srv/builds/igneum-wt-horizon/docs/plans/mission-item-4-gate/fork-gate-third-gate-on-expect-reorg.log"
+    },
+    {
+      "mode": "partition",
+      "gate": "on",
+      "expect": "reorg",
+      "must": "PASS",
+      "line": "partition heal with the gate on: the heavier side wins",
+      "slot": 4,
+      "name": "partition-gate-on-expect-reorg",
+      "verdict": "PASS",
+      "as_it_must": true,
+      "secs": 581,
+      "exit": 0,
+      "summary_line": "SUMMARY PASS (partition-gate-on-expect-reorg): side 2 held 3719 bps of the blue blocks at the fork; fork depth 194 DAA against window 60; side 2 blue work 18089683 against H1 11490863 at the heal; H1 reorged at 507.4 s (0 refusal lines, knows side 2's tip: true); side 2 kept its chain: true",
+      "summary": {
+        "pass": true,
+        "expect": "reorg",
+        "case": "partition-gate-on-expect-reorg",
+        "mode": "partition",
+        "gate": "on",
+        "window": 60,
+        "joint": 240,
+        "split": 180,
+        "watch": 150,
+        "threads": {
+          "honest_each": 1,
+          "attacker_split": 3,
+          "attacker_joint": 1
+        },
+        "keys": {
+          "h1": "8da9ddee…",
+          "h2": null,
+          "side2": "eda9cde4…"
+        },
+        "share_at_fork": {
+          "side2": 45,
+          "others": 76,
+          "side2_bps": 3719
+        },
+        "fork_daa": 245,
+        "fork_depth_daa_at_heal": 194,
+        "sinks": {
+          "joint": {
+            "h1": {
+              "hash": "5c4cb584dc015892ddff89337412ed0883d9f97b4e791e7af2f7f64764f4f1e8",
+              "blocks": 246,
+              "daa": 245,
+              "blue": 246,
+              "blueWork": "8723556",
+              "key": "8da9ddee…"
+            },
+            "h2": {
+              "hash": "5c4cb584dc015892ddff89337412ed0883d9f97b4e791e7af2f7f64764f4f1e8",
+              "blocks": 246,
+              "daa": 245,
+              "blue": 246,
+              "blueWork": "8723556",
+              "key": "8da9ddee…"
+            },
+            "side2": {
+              "hash": "5c4cb584dc015892ddff89337412ed0883d9f97b4e791e7af2f7f64764f4f1e8",
+              "blocks": 246,
+              "daa": 245,
+              "blue": 246,
+              "blueWork": "8723556",
+              "key": "8da9ddee…"
+            }
+          },
+          "split": {
+            "h1": {
+              "hash": "753507c15705f4ea8ed19bc2697a11c489a052a45f28c64f9ac3d8400fa66647",
+              "blocks": 412,
+              "daa": 411,
+              "blue": 412,
+              "blueWork": "11490863",
+              "key": "8da9ddee…"
+            },
+            "h2": {
+              "hash": "32b7c1757fa288eed0a8ab709e49fd86f72be531db19c58e63d0aeca7a34c4f6",
+              "blocks": 440,
+              "daa": 439,
+              "blue": 440,
+              "blueWork": "18089683",
+              "key": "eda9cde4…"
+            },
+            "side2": {
+              "hash": "32b7c1757fa288eed0a8ab709e49fd86f72be531db19c58e63d0aeca7a34c4f6",
+              "blocks": 440,
+              "daa": 439,
+              "blue": 440,
+              "blueWork": "18089683",
+              "key": "eda9cde4…"
+            }
+          }
+        },
+        "per_node": {
+          "h1": {
+            "held": false,
+            "reorged": true,
+            "reorg_at_s": 507.4,
+            "knows_side2_tip": true,
+            "refusal_lines": 0
+          }
+        },
+        "checks": {
+          "side2_under_a_third_at_fork": false,
+          "fork_deeper_than_window": true,
+          "side2_heavier_at_heal": true,
+          "every_honest_node_learned_side2_chain": true,
+          "every_honest_node_held": false,
+          "every_honest_node_reorged": true,
+          "every_honest_node_logged_a_refusal": false,
+          "no_honest_node_logged_a_refusal": true,
+          "side2_kept_its_chain": true
+        },
+        "failed_checks": [],
+        "refusal_example": null,
+        "node": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneumd",
+        "miner": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneum-miner",
+        "slot": 4,
+        "ports": {
+          "base": 30850,
+          "suffix": 984
+        }
+      },
+      "log": "/srv/builds/igneum-wt-horizon/docs/plans/mission-item-4-gate/fork-gate-partition-gate-on-expect-reorg.log"
+    },
+    {
+      "mode": "partition",
+      "gate": "off",
+      "expect": "reorg",
+      "must": "PASS",
+      "line": "partition heal with the gate off: the same outcome, so the heal is unchanged",
+      "slot": 5,
+      "name": "partition-gate-off-expect-reorg",
+      "verdict": "PASS",
+      "as_it_must": true,
+      "secs": 581,
+      "exit": 0,
+      "summary_line": "SUMMARY PASS (partition-gate-off-expect-reorg): side 2 held 5583 bps of the blue blocks at the fork; fork depth 191 DAA against window 60; side 2 blue work 19576159 against H1 12270631 at the heal; H1 reorged at 507.4 s (0 refusal lines, knows side 2's tip: true); side 2 kept its chain: true",
+      "summary": {
+        "pass": true,
+        "expect": "reorg",
+        "case": "partition-gate-off-expect-reorg",
+        "mode": "partition",
+        "gate": "off",
+        "window": 60,
+        "joint": 240,
+        "split": 180,
+        "watch": 150,
+        "threads": {
+          "honest_each": 1,
+          "attacker_split": 3,
+          "attacker_joint": 1
+        },
+        "keys": {
+          "h1": "8da9ddee…",
+          "h2": null,
+          "side2": "eda9cde4…"
+        },
+        "share_at_fork": {
+          "side2": 67,
+          "others": 53,
+          "side2_bps": 5583
+        },
+        "fork_daa": 244,
+        "fork_depth_daa_at_heal": 191,
+        "sinks": {
+          "joint": {
+            "h1": {
+              "hash": "58126c351aa6324a992a47fa66cca22369450c9835d312772c87d3e1aeb409a0",
+              "blocks": 245,
+              "daa": 244,
+              "blue": 245,
+              "blueWork": "9558440",
+              "key": "8da9ddee…"
+            },
+            "h2": {
+              "hash": "58126c351aa6324a992a47fa66cca22369450c9835d312772c87d3e1aeb409a0",
+              "blocks": 245,
+              "daa": 244,
+              "blue": 245,
+              "blueWork": "9558440",
+              "key": "8da9ddee…"
+            },
+            "side2": {
+              "hash": "58126c351aa6324a992a47fa66cca22369450c9835d312772c87d3e1aeb409a0",
+              "blocks": 245,
+              "daa": 244,
+              "blue": 245,
+              "blueWork": "9558440",
+              "key": "8da9ddee…"
+            }
+          },
+          "split": {
+            "h1": {
+              "hash": "a27a341c694aacf22b1a78f44d433e4104f58b23533afb73b7ee6fb9aa37afe4",
+              "blocks": 405,
+              "daa": 404,
+              "blue": 405,
+              "blueWork": "12270631",
+              "key": "8da9ddee…"
+            },
+            "h2": {
+              "hash": "f9181a06c0db716fe4ed200f6f0046c9cb8fae2eb57dd7da4697a268c434a232",
+              "blocks": 436,
+              "daa": 435,
+              "blue": 436,
+              "blueWork": "19576159",
+              "key": "eda9cde4…"
+            },
+            "side2": {
+              "hash": "f9181a06c0db716fe4ed200f6f0046c9cb8fae2eb57dd7da4697a268c434a232",
+              "blocks": 436,
+              "daa": 435,
+              "blue": 436,
+              "blueWork": "19576159",
+              "key": "eda9cde4…"
+            }
+          }
+        },
+        "per_node": {
+          "h1": {
+            "held": false,
+            "reorged": true,
+            "reorg_at_s": 507.4,
+            "knows_side2_tip": true,
+            "refusal_lines": 0
+          }
+        },
+        "checks": {
+          "side2_under_a_third_at_fork": false,
+          "fork_deeper_than_window": true,
+          "side2_heavier_at_heal": true,
+          "every_honest_node_learned_side2_chain": true,
+          "every_honest_node_held": false,
+          "every_honest_node_reorged": true,
+          "every_honest_node_logged_a_refusal": false,
+          "no_honest_node_logged_a_refusal": true,
+          "side2_kept_its_chain": true
+        },
+        "failed_checks": [],
+        "refusal_example": null,
+        "node": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneumd",
+        "miner": "/srv/builds/igneum-wt-horizon/vendor/igneum-node-horizon/target/release/igneum-miner",
+        "slot": 5,
+        "ports": {
+          "base": 30890,
+          "suffix": 985
+        }
+      },
+      "log": "/srv/builds/igneum-wt-horizon/docs/plans/mission-item-4-gate/fork-gate-partition-gate-off-expect-reorg.log"
+    }
+  ]
+}
diff --git a/infra/fast-time/fork-gate-gate.mjs b/infra/fast-time/fork-gate-gate.mjs
new file mode 100755
index 000000000..df80fe43a
--- /dev/null
+++ b/infra/fast-time/fork-gate-gate.mjs
@@ -0,0 +1,86 @@
+#!/usr/bin/env node
+// The gate line of mission item 4 (docs/analysis/mission/mission.md 2.4): "fast-time: a 51 percent fresh-key fork from
+// 15 min back is refused by every honest node; a one-third-weight fork is accepted; partition heal unchanged", with the
+// known-failed cases first. Runs the six cases of infra/fast-time/fork-gate.mjs side by side (each on its own slot:
+// ports and devnet suffix), reads each case's verdict against what it MUST be, prints the table and writes
+// docs/plans/mission-item-4-gate/summary.json. Exit 0 only when every case's verdict is the one it must give.
+//
+//   node infra/fast-time/fork-gate-gate.mjs [--parallel 6] [--only attack-gate-on-expect-hold,...] [--joint 240] [--split 180]
+//        [--watch 150] [--window 60] [--honest-threads 1] [--attacker-threads 3] [--attacker-joint-threads 2]
+//   IGNEUMD and IGNEUM_MINER name the binaries; the cases' logs land beside the summaries.
+//
+// The fork depth: the window is 60 DAA (the devnet's 600 s at 60x is 10 DAA, too few blocks to read; the window stays
+// at 60 and the split at 180 s, three windows deep; "15 min back" on the devnet is one and a half windows, which the
+// split covers from its 61st second on). The honest side mines through the split on every case (the 6 October harness
+// idled it, and a withheld chain's victim keeps mining).
+
+import { spawn } from 'node:child_process';
+import { mkdirSync, openSync, readFileSync, writeFileSync, existsSync } from 'node:fs';
+
+const ROOT = new URL('../../', import.meta.url).pathname;
+const OUT_DIR = `${ROOT}docs/plans/mission-item-4-gate`;
+const args = process.argv.slice(2);
+const sflag = (name, dflt = null) => { const i = args.indexOf(`--${name}`); return i >= 0 ? args[i + 1] : dflt; };
+const PARALLEL = Number(sflag('parallel', '6'));
+const ONLY = sflag('only') ? sflag('only').split(',') : null;
+const PASS_THROUGH = ['joint', 'split', 'watch', 'window', 'honest-threads', 'attacker-threads', 'attacker-joint-threads'].flatMap(n => sflag(n) != null ? [`--${n}`, sflag(n)] : []);
+const log = (...a) => console.log(new Date().toISOString().slice(11, 23), 'gate', ...a);
+
+// in the order the mission asks: the known-failed cases first, then the gate line, then the two sides the gate must leave alone
+const CASES = [
+  { mode: 'attack', gate: 'off', expect: 'reorg', must: 'PASS', line: "the rule's known-failed case: without the gate a fresh key's heavier deep fork wins on every honest node" },
+  { mode: 'attack', gate: 'off', expect: 'hold', must: 'FAIL', line: "the harness's own failed shape: with the gate off it must not report a hold" },
+  { mode: 'attack', gate: 'on', expect: 'hold', must: 'PASS', line: 'the gate line: a fresh-key fork from three windows back, heavier by blue work, refused by every honest node' },
+  { mode: 'third', gate: 'on', expect: 'reorg', must: 'PASS', line: 'a fork whose builder holds at least a third of the table at the fork is accepted' },
+  { mode: 'partition', gate: 'on', expect: 'reorg', must: 'PASS', line: 'partition heal with the gate on: the heavier side wins' },
+  { mode: 'partition', gate: 'off', expect: 'reorg', must: 'PASS', line: 'partition heal with the gate off: the same outcome, so the heal is unchanged' },
+].map((c, slot) => ({ ...c, slot, name: `${c.mode}-gate-${c.gate}-expect-${c.expect}` }));
+const cases = ONLY ? CASES.filter(c => ONLY.includes(c.name)) : CASES;
+if (!cases.length) { console.error(`no case matches --only ${ONLY}`); process.exit(2); }
+mkdirSync(OUT_DIR, { recursive: true });
+
+function run(c) {
+  return new Promise((resolve) => {
+    const logFile = `${OUT_DIR}/fork-gate-${c.name}.log`;
+    const out = openSync(logFile, 'w');
+    const a = [`${ROOT}infra/fast-time/fork-gate.mjs`, '--mode', c.mode, '--gate', c.gate, '--expect', c.expect, '--slot', String(c.slot), '--case', c.name, '--out', `${OUT_DIR}/fork-gate-${c.name}.json`, ...PASS_THROUGH];
+    const t0 = Date.now();
+    const p = spawn(process.execPath, a, { stdio: ['ignore', out, out], env: process.env });
+    log(`start ${c.name} (slot ${c.slot}, pid ${p.pid}): ${c.line}`);
+    p.on('exit', (code) => {
+      const secs = Math.round((Date.now() - t0) / 1000);
+      let summary = null;
+      try { summary = JSON.parse(readFileSync(`${OUT_DIR}/fork-gate-${c.name}.json`, 'utf8')); } catch { }
+      const lines = existsSync(logFile) ? readFileSync(logFile, 'utf8').split('\n') : [];
+      const summaryLine = lines.find(l => l.includes('SUMMARY ')) || lines.filter(Boolean).at(-1) || '';
+      const verdict = code === 0 ? 'PASS' : code === 1 ? 'FAIL' : `ERROR ${code}`;
+      log(`end ${c.name}: ${verdict} in ${secs} s (must ${c.must}) ${summaryLine.replace(/^.*?SUMMARY /, '')}`);
+      resolve({ ...c, verdict, as_it_must: verdict === c.must, secs, exit: code, summary_line: summaryLine.replace(/^\S+ fg\d+ /, ''), summary: summary ? { ...summary, samples: undefined } : null, log: logFile });
+    });
+  });
+}
+
+const results = [];
+const queue = cases.slice();
+async function worker() { while (queue.length) results.push(await run(queue.shift())); }
+await Promise.all(Array.from({ length: Math.min(PARALLEL, cases.length) }, worker));
+results.sort((x, y) => x.slot - y.slot);
+
+const pad = (s, n) => String(s).padEnd(n);
+console.log('');
+console.log(`${pad('case', 34)} ${pad('must', 5)} ${pad('got', 8)} ${pad('ok', 4)} ${pad('side 2 at fork', 15)} ${pad('depth', 6)} ${pad('heavier', 8)} honest nodes`);
+for (const r of results) {
+  const s = r.summary;
+  const nodes = s ? Object.entries(s.per_node).map(([n, p]) => `${n.toUpperCase()} ${p.reorged ? `reorged@${p.reorg_at_s}s` : 'held'}/${p.refusal_lines} refusals`).join(', ') : '(no summary)';
+  console.log(`${pad(r.name, 34)} ${pad(r.must, 5)} ${pad(r.verdict, 8)} ${pad(r.as_it_must ? 'yes' : 'NO', 4)} ${pad(s ? `${s.share_at_fork.side2_bps ?? 0} bps` : '?', 15)} ${pad(s ? s.fork_depth_daa_at_heal : '?', 6)} ${pad(s ? s.checks.side2_heavier_at_heal : '?', 8)} ${nodes}`);
+}
+const healUnchanged = (() => {
+  const on = results.find(r => r.name === 'partition-gate-on-expect-reorg'), off = results.find(r => r.name === 'partition-gate-off-expect-reorg');
+  if (!on || !off) return null;
+  return on.verdict === 'PASS' && off.verdict === 'PASS' && JSON.stringify(Object.values(on.summary?.per_node ?? {}).map(p => [p.reorged, p.refusal_lines])) === JSON.stringify(Object.values(off.summary?.per_node ?? {}).map(p => [p.reorged, p.refusal_lines]));
+})();
+const allGood = results.every(r => r.as_it_must) && healUnchanged !== false;
+console.log('');
+console.log(`GATE ${allGood ? 'GREEN' : 'RED'}: ${results.filter(r => r.as_it_must).length} of ${results.length} cases gave the verdict they must${healUnchanged == null ? '' : `; partition heal unchanged between gate on and off: ${healUnchanged}`}`);
+writeFileSync(`${OUT_DIR}/summary.json`, JSON.stringify({ green: allGood, at: new Date().toISOString(), heal_unchanged: healUnchanged, node: process.env.IGNEUMD ?? null, miner: process.env.IGNEUM_MINER ?? null, cases: results }, null, 2));
+process.exit(allGood ? 0 : 1);
diff --git a/infra/fast-time/fork-gate.mjs b/infra/fast-time/fork-gate.mjs
new file mode 100755
index 000000000..70c9a8076
--- /dev/null
+++ b/infra/fast-time/fork-gate.mjs
@@ -0,0 +1,325 @@
+#!/usr/bin/env node
+// Weight-gated deep fork choice (docs/analysis/51-percent.md rank 2; fork `deep_fork_refusal`, 0.3.16): the fast-time gate
+// of mission item 4 (docs/analysis/mission/mission.md 2.4, 7 October 2026). Three nodes on one fast-time network: H1 and
+// H2 are honest and mine through every phase (--honest-threads CPU threads each, so the honest side never idles); B is
+// the third node. The network mines together for --joint seconds (the weight table fills: 120 DAA at 60x), then B's two
+// links (pass-through proxies B dials) are cut and B mines a private chain with --attacker-threads for --split seconds,
+// more than the gate's window (--window DAA, 60 here against the devnet's 600 s) and heavier than the honest chain by
+// blue work. Then the links are restored and every honest node's sink is watched for --watch seconds.
+//
+//   --mode attack     B's key is FRESH: it mined nothing before the cut, so it holds 0 of the weight table at the fork
+//                     (the 51 percent renter of 51-percent.md section 1 has no history; here B holds 60 percent of the
+//                     CPU threads, 3 of 5, so its chain is heavier for sure; the refusal does not read how much heavier)
+//   --mode third      B mines through the joint phase too (--attacker-joint-threads, 2 against 1 + 1: about half of the
+//                     blue blocks at the fork, above a third), so its deep fork is ACCEPTED: both honest nodes reorg to it
+//   --mode partition  no B: H1 against H2, each with half of the weight; H2 mines heavier through the split; at the heal
+//                     H1 takes H2's chain and H2 keeps it, with the gate on exactly as with it off (the heal is unchanged)
+//   --gate on|off     fork_gate_activation_daa 0, or the switch at never
+//   --expect hold|reorg   which outcome of the honest side is a PASS. `--mode attack --gate off --expect reorg` is the
+//                     rule's known-failed case (the attack succeeds without the gate) and must PASS;
+//                     `--mode attack --gate off --expect hold` is the harness's own failed shape and must FAIL.
+//
+//   node infra/fast-time/fork-gate.mjs --mode attack --gate on --expect hold [--joint 240] [--split 180] [--watch 150]
+//        [--window 60] [--honest-threads 1] [--attacker-threads 3] [--attacker-joint-threads 2] [--slot 0] [--out <file>]
+//   IGNEUMD and IGNEUM_MINER name the binaries. --slot k moves the ports and the devnet suffix so cases run side by side
+//   (infra/fast-time/fork-gate-gate.mjs runs the mission's six at once).
+//
+// A "reorg" is read from the chain, never from a key: the honest node's sink at the cut (its pre-cut tip) is asked of
+// getVirtualChainFromBlock, and the node has reorged when that call lists removed chain blocks (the pre-cut tip left the
+// selected chain). The 6 October harness read the sink's key and misread a block B had mined into the shared chain.
+//
+// Leftovers of an earlier run of the same slot are stopped by PID FILE, never by name (CLAUDE.md, 6 October 2026): every
+// process this harness starts is written to <tmp>/pids, and a pid is killed only when /proc/<pid>/cmdline carries this
+// slot's data directory or one of its ports.
+
+import { spawn } from 'node:child_process';
+import { createServer, connect as netConnect } from 'node:net';
+import { mkdirSync, rmSync, writeFileSync, readFileSync, openSync, existsSync, appendFileSync } from 'node:fs';
+import { Rpc } from '../../tools/finality-attacks/lib/rpc.mjs';
+
+const ROOT = new URL('../../', import.meta.url).pathname;
+const FILE = `${ROOT}infra/fast-time/override-60x.json`;
+const IGNEUMD = process.env.IGNEUMD || `${ROOT}vendor/igneum-node/target-integration/release/igneumd`;
+const CPU_MINER = process.env.IGNEUM_MINER || `${ROOT}vendor/igneum-node/target-integration/release/igneum-miner`;
+const args = process.argv.slice(2);
+const flag = (name, dflt) => { const i = args.indexOf(`--${name}`); return i >= 0 ? Number(args[i + 1]) : dflt; };
+const sflag = (name, dflt = null) => { const i = args.indexOf(`--${name}`); return i >= 0 ? args[i + 1] : dflt; };
+const MODE = sflag('mode', 'attack');
+const GATE = sflag('gate', 'on');
+const EXPECT = sflag('expect', MODE === 'attack' && GATE === 'on' ? 'hold' : 'reorg');
+const JOINT = flag('joint', 240), SPLIT = flag('split', 180), WATCH = flag('watch', 150), WINDOW = flag('window', 60);
+const HT = flag('honest-threads', 1), AT = flag('attacker-threads', 3), AJT = flag('attacker-joint-threads', 2);
+const SLOT = flag('slot', 0);
+const GENESIS_BITS = flag('genesis-bits', 0x1f010000);
+const CASE = sflag('case') || `${MODE}-gate-${GATE}-expect-${EXPECT}`;
+const OUT = sflag('out') || `${ROOT}docs/plans/mission-item-4-gate/fork-gate-${CASE}.json`;
+// nodes at BASE + i x 10 (gRPC, p2p, JSON-RPC, EVM RPC), the links at BASE + 31 and + 32; a slot is 40 ports wide. 30690 and up
+// is clear of every other fast-time harness (difficulty 29790s, vote-or-burn 29990s, the 6 October fork gate 30090s, miner-stall
+// 30290s, peer-drop 30390s, nuisance 30490s, headers-proof 30590s).
+const BASE = 30690 + SLOT * 40, SUFFIX = 980 + SLOT;
+const TMP = `/tmp/igneum-fast-time-fg${SLOT}`;
+const NEVER = '18446744073709551615';
+if (!['attack', 'third', 'partition'].includes(MODE) || !['on', 'off'].includes(GATE) || !['hold', 'reorg'].includes(EXPECT)) {
+  console.error('usage: --mode attack|third|partition --gate on|off --expect hold|reorg'); process.exit(2);
+}
+const started = [];
+const log = (...a) => console.log(new Date().toISOString().slice(11, 23), `fg${SLOT}`, ...a);
+const sleep = (ms) => new Promise(r => setTimeout(r, ms));
+for (const b of [IGNEUMD, CPU_MINER]) if (!existsSync(b)) { console.error(`missing ${b}`); process.exit(2); }
+
+// leftovers of an earlier run of this slot, by pid file (never by name)
+const PIDS = `${TMP}/pids`;
+function stopLeftovers() {
+  if (!existsSync(PIDS)) return;
+  const ports = Array.from({ length: 40 }, (_, k) => `127.0.0.1:${BASE + k}`);
+  for (const line of readFileSync(PIDS, 'utf8').split('\n').filter(Boolean)) {
+    const pid = Number(line);
+    let cmd = '';
+    try { cmd = readFileSync(`/proc/${pid}/cmdline`, 'utf8'); } catch { continue; }
+    if (!cmd.includes(TMP) && !ports.some(p => cmd.includes(p))) continue;
+    try { process.kill(pid, 'SIGKILL'); log(`stopped leftover pid ${pid} of an earlier run`); } catch { }
+  }
+}
+stopLeftovers();
+await sleep(1000);
+rmSync(TMP, { recursive: true, force: true }); mkdirSync(TMP, { recursive: true });
+const track = (proc) => { started.push(proc); try { appendFileSync(PIDS, `${proc.pid}\n`); } catch { } };
+
+const baseText = readFileSync(FILE, 'utf8');
+const field = (name) => { const m = new RegExp(`"${name}":\\s*([0-9]+)`).exec(baseText); return m ? +m[1] : undefined; };
+export function mergeOverrideText(text, fields) {
+  let out = text;
+  for (const k of Object.keys(fields)) out = out.replace(new RegExp(`\\s*"${k}":\\s*[^,}\\n]+,?`), '');
+  const extra = Object.entries(fields).map(([k, v]) => `"${k}": ${typeof v === 'string' && !/^\d+$/.test(v) ? JSON.stringify(v) : v}`).join(', ');
+  return out.replace(/,?\s*}\s*$/, `,\n  ${extra}\n}\n`);
+}
+const DAY_MS = field('pow_day_ms');
+const WEIGHT_WINDOW = field('weight_window') || 120;
+const override = `${TMP}/override.json`;
+writeFileSync(override, mergeOverrideText(baseText, {
+  genesis_bits: GENESIS_BITS, skip_proof_of_work: false,
+  fork_gate_activation_daa: GATE === 'on' ? '0' : NEVER, fork_gate_window_daa: WINDOW,
+  program_class_v3_activation_daa: NEVER, program_class_v4_activation_daa: NEVER,
+}));
+log(`case ${CASE}: mode ${MODE}, gate ${GATE} (window ${WINDOW} DAA), joint ${JOINT} s, split ${SPLIT} s, watch ${WATCH} s, honest ${HT} thread(s) each, attacker ${AT} (joint ${MODE === 'third' ? AJT : MODE === 'partition' ? HT : 0}), expect ${EXPECT}`);
+
+// a pass-through proxy: open = the link is up; closed = the partition
+class Link {
+  constructor(listenPort, targetPort) { this.listenPort = listenPort; this.targetPort = targetPort; this.socks = new Set(); this.up = false; }
+  open() {
+    return new Promise((resolve) => {
+      this.server = createServer((client) => {
+        const upstream = netConnect(this.targetPort, '127.0.0.1');
+        this.socks.add(client); this.socks.add(upstream);
+        client.pipe(upstream); upstream.pipe(client);
+        for (const s of [client, upstream]) { s.on('error', () => { }); s.on('close', () => { this.socks.delete(s); if (!client.destroyed) client.destroy(); if (!upstream.destroyed) upstream.destroy(); }); }
+      });
+      this.server.listen(this.listenPort, '127.0.0.1', () => { this.up = true; resolve(this); });
+    });
+  }
+  close() {
+    return new Promise((resolve) => {
+      this.up = false;
+      for (const s of this.socks) { try { s.destroy(); } catch { } }
+      this.socks.clear();
+      if (this.server) this.server.close(() => resolve()); else resolve();
+      this.server = null;
+    });
+  }
+}
+
+class Node {
+  constructor(name, i, peers = []) {
+    this.name = name; this.i = i; this.grpcPort = BASE + i * 10; this.p2pPort = BASE + i * 10 + 1; this.jsonPort = BASE + i * 10 + 2; this.evmPort = BASE + i * 10 + 3;
+    this.peers = peers; this.dir = `${TMP}/${name}`; this.logFile = `${this.dir}/node.log`;
+  }
+  get grpc() { return `grpc://127.0.0.1:${this.grpcPort}`; }
+  async start() {
+    mkdirSync(this.dir, { recursive: true });
+    const a = ['--devnet', `--devnet-suffix=${SUFFIX}`, '--nodnsseed', '--disable-upnp', '--nologfiles', '--enable-unsynced-mining', '--utxoindex',
+      `--appdir=${this.dir}`, `--rpclisten=127.0.0.1:${this.grpcPort}`, `--rpclisten-json=127.0.0.1:${this.jsonPort}`, `--evm-rpclisten=127.0.0.1:${this.evmPort}`,
+      `--listen=127.0.0.1:${this.p2pPort}`, `--override-params-file=${override}`, '--loglevel=info', '--yes'];
+    // --addpeer, not --connect: a dropped addpeer is dialled again, which is how a link heals
+    if (this.peers.length) for (const p of this.peers) a.push(`--addpeer=127.0.0.1:${p}`); else a.push('--outpeers=0');
+    const out = openSync(this.logFile, 'a');
+    this.proc = spawn(IGNEUMD, a, { stdio: ['ignore', out, out] });
+    track(this.proc);
+    await sleep(1500);
+    if (this.proc.exitCode != null) throw new Error(`${this.name} exited ${this.proc.exitCode}: ${this.grepLog(/ERROR|Error|error|refused|invalid/).slice(-3).join(' | ')}`);
+    // the RPC must answer before the node is used (the 6 October harness called it one tick after the socket opened)
+    for (let i = 0; i < 20; i++) {
+      const rpc = new Rpc(`ws://127.0.0.1:${this.jsonPort}`);
+      try { if (await rpc.connect()) { await rpc.call('getBlockDagInfo'); this.rpc = rpc; break; } } catch { try { rpc.close(); } catch { } }
+      this.rpc = null; await sleep(500);
+    }
+    if (!this.rpc) throw new Error(`${this.name}: the RPC did not answer within 10 s`);
+    log(`${this.name} up pid ${this.proc.pid} json ${this.jsonPort} p2p ${this.p2pPort}${this.peers.length ? ` addpeer ${this.peers.join(',')}` : ''}`);
+    return this;
+  }
+  grepLog(re) { try { return readFileSync(this.logFile, 'utf8').split('\n').filter(l => re.test(l)); } catch { return []; } }
+  async block(hash) { const b = await this.rpc.call('getBlock', { hash, includeTransactions: false }); return b.block; }
+  async sink() {
+    const d = await this.rpc.call('getBlockDagInfo');
+    const b = await this.block(d.sink);
+    const bw = b.header.blueWork;
+    const blueWork = typeof bw === 'string' ? BigInt(bw.startsWith('0x') ? bw : `0x${bw}`) : BigInt(bw);
+    return { hash: d.sink, blocks: +d.blockCount, daa: +b.header.daaScore, blue: +b.header.blueScore, blueWork, key: String(b.header.voteKeyHash) };
+  }
+  /// whether `hash` (a block that was on this node's selected chain) has left it: the chain path from it to the sink
+  /// lists removed chain blocks exactly when it did
+  async reorgedFrom(hash) {
+    try {
+      const r = await this.rpc.call('getVirtualChainFromBlock', { startHash: hash, includeAcceptedTransactionIds: false });
+      return (r.removedChainBlockHashes || []).length > 0;
+    } catch (e) { return null; }
+  }
+  async knows(hash) { try { await this.block(hash); return true; } catch { return false; } }
+}
+const miners = {};
+function miner(name, grpc, threads, secs, label = name) {
+  // `label` is the vote-key label (the key); `name` the log file and the handle, so a restarted miner keeps its key
+  const out = openSync(`${TMP}/${name}.log`, 'a');
+  const p = spawn(CPU_MINER, ['mine', grpc, String(threads), String(secs), label, '--engine', 'igneum-pow', '--payout-label', label, '--status-secs', '30', '--no-vote'], { stdio: ['ignore', out, out], env: { ...process.env, IGNEUM_POW_DAY_MS: String(DAY_MS) } });
+  track(p); miners[name] = p;
+  return p;
+}
+const minerKey = (name) => { try { const m = /vote_key_hash=([0-9a-f]{64})/.exec(readFileSync(`${TMP}/${name}.log`, 'utf8')); return m ? m[1] : null; } catch { return null; } };
+const links = [];
+async function stopAll() {
+  for (const p of started.slice().reverse()) { try { p.kill('SIGINT'); } catch { } }
+  await sleep(1500);
+  for (const p of started) { try { p.kill('SIGKILL'); } catch { } }
+  for (const l of links) { try { await l.close(); } catch { } }
+}
+process.on('SIGINT', async () => { await stopAll(); process.exit(130); });
+process.on('unhandledRejection', async (e) => { log(`FAILED: ${e?.stack || e}`); await stopAll(); process.exit(3); });
+
+// topology: H1 listens; H2 dials H1 (directly, or through a cuttable link in partition mode); B dials H1 and H2 through
+// two cuttable links. The honest set is every node whose chain the gate is meant to keep: H1 and H2, or H1 alone in
+// partition mode (where H2 is the heavier side).
+const h1 = await new Node('h1', 0).start();
+let h2, b = null, side2;
+if (MODE === 'partition') {
+  const l0 = await new Link(BASE + 31, h1.p2pPort).open(); links.push(l0);
+  h2 = await new Node('h2', 1, [l0.listenPort]).start();
+  side2 = h2;
+} else {
+  h2 = await new Node('h2', 1, [h1.p2pPort]).start();
+  const l1 = await new Link(BASE + 31, h1.p2pPort).open(); links.push(l1);
+  const l2 = await new Link(BASE + 32, h2.p2pPort).open(); links.push(l2);
+  b = await new Node('b', 2, [l1.listenPort, l2.listenPort]).start();
+  side2 = b;
+}
+const honest = MODE === 'partition' ? [h1] : [h1, h2];
+const side2Label = MODE === 'partition' ? 'fg-h2' : 'fg-b';
+await sleep(3000);
+const t0 = Date.now();
+const since = () => ((Date.now() - t0) / 1000).toFixed(1);
+const total = JOINT + SPLIT + WATCH + 60;
+
+// phase 1: together. The honest miners run through every phase; side 2 mines in the joint phase only in third and
+// partition mode (its key must hold weight at the fork), never in attack mode (its key must be fresh).
+miner('fg-h1', h1.grpc, HT, total);
+if (MODE !== 'partition') miner('fg-h2', h2.grpc, HT, total);
+if (MODE === 'third') miner('fg-b', b.grpc, AJT, JOINT);
+if (MODE === 'partition') miner('fg-h2', h2.grpc, HT, JOINT);
+await sleep(JOINT * 1000);
+const keys = { h1: minerKey('fg-h1'), h2: MODE === 'partition' ? null : minerKey('fg-h2'), side2: MODE === 'third' || MODE === 'partition' ? minerKey(side2Label) : null };
+const joint = { h1: await h1.sink(), h2: await h2.sink(), side2: await side2.sink() };
+log(`phase 1 done at ${since()} s: H1 ${joint.h1.blocks} blocks sink ${joint.h1.hash.slice(0, 8)} daa ${joint.h1.daa}; H2 ${joint.h2.blocks} sink ${joint.h2.hash.slice(0, 8)}; side 2 (${side2.name}) ${joint.side2.blocks} sink ${joint.side2.hash.slice(0, 8)}; keys H1 ${keys.h1?.slice(0, 8)} H2 ${keys.h2?.slice(0, 8)} side2 ${keys.side2?.slice(0, 8) ?? 'fresh (none yet)'}`);
+// the weight at the fork: builders of the last WEIGHT_WINDOW chain blocks of H1's chain and their mergesets, by key
+async function shareAt(node, upTo, key) {
+  let cur = upTo, mine = 0, others = 0;
+  for (let i = 0; i < WEIGHT_WINDOW; i++) {
+    const blk = await node.block(cur);
+    const sp = blk.verboseData?.selectedParentHash;
+    for (const h of [cur, ...(blk.verboseData?.mergeSetBluesHashes || []).filter(x => x !== sp)]) {
+      const hb = h === cur ? blk : await node.block(h);
+      if (key && String(hb.header.voteKeyHash) === key) mine++; else others++;
+    }
+    if (!sp || +blk.header.daaScore <= 1) break; cur = sp;
+  }
+  return { side2: mine, others, side2_bps: mine + others ? Math.round(10000 * mine / (mine + others)) : null };
+}
+const share = await shareAt(h1, joint.h1.hash, keys.side2);
+log(`weight at the fork (last ${share.side2 + share.others} blue blocks of H1's chain): side 2 ${share.side2}, others ${share.others}, side 2 ${share.side2_bps} bps`);
+
+// phase 2: the partition; the honest side keeps mining, side 2 mines heavier
+for (const l of links) await l.close();
+if (miners[side2Label]) { try { miners[side2Label].kill('SIGINT'); } catch { } await sleep(2000); }
+miner(`${side2Label}-split`, side2.grpc, AT, SPLIT + WATCH + 60, side2Label);
+log(`links cut at ${since()} s; side 2 (${side2.name}) now mines with ${AT} thread(s), the honest side with ${HT} each`);
+await sleep(SPLIT * 1000);
+if (!keys.side2) keys.side2 = minerKey(`${side2Label}-split`);
+const preCut = {};
+for (const n of honest) preCut[n.name] = await n.sink();
+const split = { h1: await h1.sink(), h2: await h2.sink(), side2: await side2.sink() };
+const forkDaa = joint.h1.daa;
+const forkDepthAtHeal = Math.max(split.side2.daa, split.h1.daa) - forkDaa;
+const heavier = split.side2.blueWork > split.h1.blueWork;
+log(`phase 2 done at ${since()} s: H1 ${split.h1.blocks} blocks sink ${split.h1.hash.slice(0, 8)} daa ${split.h1.daa} blue ${split.h1.blue} work ${split.h1.blueWork}; side 2 ${split.side2.blocks} sink ${split.side2.hash.slice(0, 8)} daa ${split.side2.daa} blue ${split.side2.blue} work ${split.side2.blueWork} (side 2 heavier: ${heavier}); fork depth ${forkDepthAtHeal} DAA against window ${WINDOW}`);
+
+// phase 3: heal and watch every honest node's chain
+for (const l of links) await l.open();
+log(`links restored at ${since()} s; watching ${honest.map(n => n.name.toUpperCase()).join(' and ')} for ${WATCH} s`);
+const samples = [];
+const reorgAt = {};
+const healAt = Date.now();
+const side2PreHeal = split.side2;
+while (Date.now() - healAt < WATCH * 1000) {
+  await sleep(5000);
+  const s = { t: +since() };
+  for (const n of honest) {
+    const sk = await n.sink();
+    const reorged = await n.reorgedFrom(preCut[n.name].hash);
+    s[n.name] = { blocks: sk.blocks, sink: sk.hash.slice(0, 16), daa: sk.daa, blue: sk.blue, key: sk.key.slice(0, 8), reorged, knows_side2_tip: await n.knows(side2PreHeal.hash) };
+    if (reorged && reorgAt[n.name] == null) { reorgAt[n.name] = +since(); log(`${n.name.toUpperCase()} left its pre-cut chain at ${since()} s: sink ${sk.hash.slice(0, 16)} by ${sk.key.slice(0, 8)}`); }
+  }
+  const s2 = await side2.sink();
+  s.side2 = { blocks: s2.blocks, sink: s2.hash.slice(0, 16), blue: s2.blue, reorged: await side2.reorgedFrom(side2PreHeal.hash) };
+  samples.push(s);
+  if (samples.length % 6 === 0) log(`t=${since()} s ${honest.map(n => `${n.name.toUpperCase()} ${s[n.name].blocks} blocks sink ${s[n.name].sink.slice(0, 8)} ${s[n.name].reorged ? 'REORGED' : 'held'}`).join('; ')}; side 2 ${s2.blocks} blocks sink ${s2.hash.slice(0, 8)}`);
+}
+const last = samples.at(-1);
+const refusals = {};
+for (const n of honest) refusals[n.name] = n.grepLog(/Fork choice: block .* not a sink candidate/).length;
+const perNode = {};
+for (const n of honest) perNode[n.name] = { held: samples.every(s => s[n.name].reorged === false), reorged: last?.[n.name].reorged === true, reorg_at_s: reorgAt[n.name] ?? null, knows_side2_tip: last?.[n.name].knows_side2_tip === true, refusal_lines: refusals[n.name] };
+const every = (f) => honest.every(n => f(perNode[n.name]));
+const checks = {
+  side2_under_a_third_at_fork: share.side2_bps != null && share.side2_bps * 3 < 10000,
+  fork_deeper_than_window: forkDepthAtHeal > WINDOW,
+  side2_heavier_at_heal: heavier,
+  every_honest_node_learned_side2_chain: every(p => p.knows_side2_tip),
+  every_honest_node_held: every(p => p.held),
+  every_honest_node_reorged: every(p => p.reorged),
+  every_honest_node_logged_a_refusal: every(p => p.refusal_lines > 0),
+  no_honest_node_logged_a_refusal: every(p => p.refusal_lines === 0),
+  side2_kept_its_chain: samples.every(s => s.side2.reorged === false),
+};
+const wantUnderThird = MODE === 'attack';
+const good = EXPECT === 'hold'
+  ? checks.side2_under_a_third_at_fork === wantUnderThird && checks.fork_deeper_than_window && checks.side2_heavier_at_heal && checks.every_honest_node_learned_side2_chain && checks.every_honest_node_held && checks.every_honest_node_logged_a_refusal && checks.side2_kept_its_chain
+  : checks.side2_under_a_third_at_fork === wantUnderThird && checks.fork_deeper_than_window && checks.side2_heavier_at_heal && checks.every_honest_node_reorged && checks.no_honest_node_logged_a_refusal && checks.side2_kept_its_chain;
+const needed = EXPECT === 'hold'
+  ? ['side2_under_a_third_at_fork', 'fork_deeper_than_window', 'side2_heavier_at_heal', 'every_honest_node_learned_side2_chain', 'every_honest_node_held', 'every_honest_node_logged_a_refusal', 'side2_kept_its_chain']
+  : ['side2_under_a_third_at_fork', 'fork_deeper_than_window', 'side2_heavier_at_heal', 'every_honest_node_reorged', 'no_honest_node_logged_a_refusal', 'side2_kept_its_chain'];
+const fails = needed.filter(k => (k === 'side2_under_a_third_at_fork' ? checks[k] !== wantUnderThird : !checks[k]));
+const refusalExample = honest.map(n => n.grepLog(/Fork choice: block .* not a sink candidate/)[0]).find(Boolean)?.replace(/^.*?Fork choice/, 'Fork choice') ?? null;
+const summary = {
+  pass: good, expect: EXPECT, case: CASE, mode: MODE, gate: GATE, window: WINDOW, joint: JOINT, split: SPLIT, watch: WATCH,
+  threads: { honest_each: HT, attacker_split: AT, attacker_joint: MODE === 'third' ? AJT : MODE === 'partition' ? HT : 0 },
+  keys: Object.fromEntries(Object.entries(keys).map(([k, v]) => [k, short(v)])), share_at_fork: share, fork_daa: forkDaa, fork_depth_daa_at_heal: forkDepthAtHeal,
+  sinks: { joint: strip(joint), split: strip(split) }, per_node: perNode, checks, failed_checks: fails, refusal_example: refusalExample,
+  samples, node: IGNEUMD, miner: CPU_MINER, slot: SLOT, ports: { base: BASE, suffix: SUFFIX },
+};
+// a key in a summary is its first 8 hex and an ellipsis, never the 64 (7 October 2026: the 6 October summaries' raw keys
+// turned the no-secrets check red on every CI run of their branch; a 64-hex value next to the word key is a secret shape)
+const short = (k) => (typeof k === 'string' && k.length === 64 ? `${k.slice(0, 8)}…` : k);
+function strip(o) { const r = {}; for (const [k, v] of Object.entries(o)) r[k] = { ...v, blueWork: v.blueWork.toString(), key: short(v.key) }; return r; }
+mkdirSync(OUT.replace(/\/[^/]+$/, ''), { recursive: true });
+writeFileSync(OUT, JSON.stringify(summary, null, 2));
+log(`SUMMARY ${good ? 'PASS' : 'FAIL'} (${CASE}): side 2 held ${share.side2_bps ?? 0} bps of the blue blocks at the fork; fork depth ${forkDepthAtHeal} DAA against window ${WINDOW}; side 2 blue work ${split.side2.blueWork} against H1 ${split.h1.blueWork} at the heal; ${honest.map(n => `${n.name.toUpperCase()} ${perNode[n.name].reorged ? `reorged at ${perNode[n.name].reorg_at_s} s` : 'held'} (${perNode[n.name].refusal_lines} refusal lines, knows side 2's tip: ${perNode[n.name].knows_side2_tip})`).join('; ')}; side 2 kept its chain: ${checks.side2_kept_its_chain}${fails.length ? `; FAILED CHECK ${fails.join(', ')}` : ''}`);
+log(`summary: ${OUT}`);
+await stopAll();
+process.exit(good ? 0 : 1);
diff --git a/tools/ci/whole-body-check.sh b/tools/ci/whole-body-check.sh
index 983681055..b395986ea 100755
--- a/tools/ci/whole-body-check.sh
+++ b/tools/ci/whole-body-check.sh
@@ -9,7 +9,7 @@
 #   tools/ci/whole-body-check.sh --self-test  # the real tools pass; a copy with the block removed fails
 set -euo pipefail
 cd "$(dirname "$0")/../.."
-TOOLS=(tools/build-remote.sh tools/cross-remote.sh tools/workers-remote.sh infra/build-server/hands/move-hand.sh)
+TOOLS=(tools/build-remote.sh tools/cross-remote.sh tools/workers-remote.sh tools/fast-time-remote.sh infra/build-server/hands/move-hand.sh)
 check() {   # <file>
   local f="$1" src
   src=$(grep -nE '^\. "\$HERE/(\.\./)+(infra/build-server/)?lib\.sh"' "$f" | head -1 | cut -d: -f1)
diff --git a/tools/fast-time-remote.sh b/tools/fast-time-remote.sh
new file mode 100755
index 000000000..c5f3e3a21
--- /dev/null
+++ b/tools/fast-time-remote.sh
@@ -0,0 +1,83 @@
+#!/usr/bin/env bash
+# shellcheck disable=SC2034  # the BS_* context variables are read by lib.sh
+# Run a fast-time harness (infra/fast-time/*.mjs, tools/finality-attacks) ON a build box instead of the Mac (CLAUDE.md,
+# 7 October 2026: nothing heavy on the Mac), under a box slot with a holder line the workers dashboard shows and one JSONL
+# line in /srv/builds/_log/builds.jsonl, the way tools/build-remote.sh runs cargo. The repo worktree's HEAD goes to the box
+# through the bare mirror (checked out at /srv/builds/<worktree>), the harness directories are overlaid by rsync (uncommitted
+# edits travel, every written file re-stamped with touch in lib.sh's bs_overlay_dir), the command runs at the worktree root
+# on the box with IGNEUMD and IGNEUM_MINER pointing at a node build already there (a fork worktree's target/release under the
+# same worktree root, built by tools/build-remote.sh from that fork worktree), and the result directory comes back.
+#
+#   tools/fast-time-remote.sh [--box N] [--priority gate|normal] --node-bin <dir on the box, or relative to the worktree root>
+#                             [--fetch <dir relative to the worktree root>] [--label <text>] -- <command at the worktree root>
+#
+#   tools/fast-time-remote.sh --priority gate --node-bin vendor/igneum-node-horizon/target/release \
+#       --fetch docs/plans/mission-item-4-gate -- node infra/fast-time/fork-gate-gate.mjs
+#
+# Class: `--priority gate` (nice 0, the full core set, a slot ahead of queued suites; box 1: a release or mission gate) or
+# normal (nice 10 on the last 32 cores like a suite, box 2 by lib.sh bs_route's attack class). The command never starts with
+# cargo: build on the box first with tools/build-remote.sh from the fork worktree, then point --node-bin at its target.
+# Added for mission item 4 (the fork-gate gate), 7 October 2026.
+set -euo pipefail
+HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+# shellcheck disable=SC2034
+BS_TOOL=fast-time-remote
+# shellcheck source=../infra/build-server/lib.sh
+. "$HERE/../infra/build-server/lib.sh"
+
+{ # whole-body: bash parses this block entirely before running a line of it, so an edit to this file while a run is in
+  # flight cannot reach the running copy (7 Oct 2026: build-remote.sh was edited mid-run and died on shifted bytes after a 4-min build)
+BOX="${BOX:-}"; PRIORITY="${PRIORITY:-normal}"; NODE_BIN=""; FETCH=""; LABEL=""; CMD=()
+while [ $# -gt 0 ]; do
+  case "$1" in
+    --box) BOX="$2"; shift 2 ;;
+    --priority) PRIORITY="$2"; shift 2 ;;
+    --node-bin) NODE_BIN="$2"; shift 2 ;;
+    --fetch) FETCH="$2"; shift 2 ;;
+    --label) LABEL="$2"; shift 2 ;;
+    --) shift; CMD=("$@"); break ;;
+    *) bs_die "unknown argument $1 (the command follows --)" ;;
+  esac
+done
+[ ${#CMD[@]} -gt 0 ] || bs_die "no command: tools/fast-time-remote.sh [options] -- node infra/fast-time/<harness>.mjs ..."
+[ -n "$NODE_BIN" ] || bs_die "--node-bin names the directory on the box that holds igneumd and igneum-miner (a fork worktree's target/release)"
+case "$PRIORITY" in gate|normal) ;; *) bs_die "--priority takes gate or normal, not '$PRIORITY'" ;; esac
+case "${CMD[0]}" in cargo) bs_die "the command must not be cargo: build with tools/build-remote.sh first" ;; esac
+# the class: a gate runs at nice 0 on the full set, a slot ahead of queued suites, on box 1; normal is the bounded class on box 2
+if [ "$PRIORITY" = gate ]; then BR_NICE=0; BR_CORES=0; BR_JOBS_CAP=0; BR_PRIORITY=gate; BR_KIND=gate; else BR_NICE=10; BR_CORES=32; BR_JOBS_CAP=32; BR_PRIORITY=normal; BR_KIND=other; fi
+export BR_NICE BR_CORES BR_JOBS_CAP BR_PRIORITY BR_KIND
+if [ -z "$BOX" ]; then if [ "$PRIORITY" = gate ]; then BOX=1; else BOX=$(bs_route attack); fi; fi
+bs_host "$BOX"
+# the context by hand (bs_context wants a crate): the repo worktree root is the tree; lib.sh reads these
+BS_TOP=$(git -C "$HERE" rev-parse --show-toplevel); BS_WT_ROOT="$BS_TOP"; BS_KIND=repo; BS_MIRROR="$BS_MIRROR_REPO"; BS_TOP_REL=.
+BS_WT=$(basename "$BS_WT_ROOT"); BS_CRATE_REL=infra/fast-time; BS_REMOTE_WT="$BS_ROOT_REMOTE/$BS_WT"; BS_REMOTE_CRATE="$BS_REMOTE_WT"
+BS_BRANCH=$(git -C "$BS_TOP" branch --show-current 2>/dev/null || true); BS_SHA=$(git -C "$BS_TOP" rev-parse HEAD); [ -n "$BS_BRANCH" ] || BS_BRANCH="detached-$(git -C "$BS_TOP" rev-parse --short HEAD)"
+BS_LOCAL_DIRS="infra/fast-time tools/finality-attacks"; BS_VENDOR_REPOS=""
+case "$NODE_BIN" in /*) ;; *) NODE_BIN="$BS_REMOTE_WT/$NODE_BIN" ;; esac
+bs_log "box $BOX ($BS_HOST) for priority $PRIORITY: ${CMD[*]} from $BS_WT at $BS_SHA ($BS_BRANCH), node binaries $NODE_BIN"
+bs_ssh "[ -x '$NODE_BIN/igneumd' ] && [ -x '$NODE_BIN/igneum-miner' ]" || bs_die "no igneumd and igneum-miner at $NODE_BIN on the box: build them there first (tools/build-remote.sh from the fork worktree)"
+# the harness directories by overlay only, never a checkout of the worktree root: on a box where the root is no repo
+# checkout (every box a node build alone has touched) remote-run's checkout mode replaces the directory, and at 13:44 UK on
+# 7 October 2026 the first run of this wrapper took igneum-build-2's /srv/builds/igneum-wt-horizon/vendor (the fork sources
+# and the gate binary just built there) with it
+bs_wt_lock
+bs_ssh "mkdir -p '$BS_REMOTE_WT'"
+for d in $BS_LOCAL_DIRS; do bs_overlay_dir "$d"; done
+bs_log "harness sources in place (overlay only; changed files re-stamped with touch by bs_overlay_dir)"
+quoted=""; for a in "${CMD[@]}"; do quoted="$quoted $(printf '%q' "$a")"; done
+cmd="export IGNEUMD=$(printf '%q' "$NODE_BIN/igneumd") IGNEUM_MINER=$(printf '%q' "$NODE_BIN/igneum-miner") IGNEUM_NODE_ROOT=$(printf '%q' "$BS_REMOTE_WT/"); $quoted"
+BR_COMMAND="${CMD[*]}"; BR_TARGET=x86_64-unknown-linux-gnu; BR_ARTEFACTS=""; export BR_COMMAND BR_TARGET BR_ARTEFACTS
+[ -n "$LABEL" ] || LABEL="fast-time ${CMD[*]}"
+label="$BS_WT $LABEL; kind=$BR_KIND nice=$BR_NICE cores=$( [ "$BR_CORES" = 0 ] && echo 96 || echo "$BR_CORES")"
+set +e
+bs_remote_run "$BS_REMOTE_WT" "$label" "$cmd"
+rc=$?
+set -e
+if [ -n "$FETCH" ]; then
+  mkdir -p "$BS_WT_ROOT/$FETCH"
+  bs_rsync -r "$BS_HOST:$BS_REMOTE_WT/$FETCH/" "$BS_WT_ROOT/$FETCH/" && bs_log "fetched $FETCH from the box" || bs_log "fetch of $FETCH failed (the run's rc was $rc)"
+fi
+bs_log "done: rc $rc"
+[ "$rc" = 0 ] || exit "$rc"
+exit 0
+}