X14: the signing half. No RPC exposes a certificate's signer set, so
tools/finality-attacks/x14-concentration.mjs now walks the selected
chain over the window, decodes the coinbase finality section (IGNF
trailer: votes, certificates, evidence, the IGNK reveal), rebuilds the
canonical voter list at every checkpoint from headers the way the node's
compute_weights does, and maps every bitmap through it. Read-only on the
Mac observer node under the run lock, node version and DAA recorded,
two readings kept (the window straddles the 0.3.10 restart). Result at
23:00:44 UTC, DAA 138,542: signed weight over the heaviest certificate
per index, 27 keys, top-1 10.0%, top-3 29.1%, top-10 77.3%; hashing
6.4/19.2/60.1, aggregation 44.9/84.1/100, proving 100/100/100. Checks:
240 of 240 rebuilt voter lists equal the node's count, 194 of 194
certificates mapped, 27 reveals against BLAKE2b with 0 mismatches.
Status moved to Answered with evidence for all four; the old status
kept after "Was:". Bench-log entry appended.
X5 (paragraph only; Status stays Decision owner: the project lead): the observer
columns of O-X.1 on this branch, not deployed, the running observer
untouched: live_peer_asn (offline prefix table, no third-party lookup),
live_key_machines (machine fingerprint per vote key from the log
intake), live_pool_statements (signed JSON {pool, keys[], signed_at},
Ed25519, parser and verifier), live_concentration (nightly top-1/3/10
for the four concentrations plus N_ind labelled "proposed definition").
Pure functions in tools/observer/lib/concentration.mjs and
lib/nightly.mjs; keyed BLAKE2b in tools/finality-attacks/lib/blake2b.mjs;
9 node:test tests, all passing.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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