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<meta name="description" content="A the devnet payment receipt proven against the finality certificate, downloadable as JSON and re-verified offline by anyone with a one-file verifier. the devnet, no value.">
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/* reference apps (8 Oct 2026): the verify form, the proven headline, the step list; tokens and components are in /site.css */
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<a class="skip" href="#main">Skip to content</a>
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<a href="/" class="logo" aria-label="Igneum home">
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<span class="word">IGNEUM</span>
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<span class="devnet" id="nav-devnet" title="igneum-devnet-4, the Igneum 2.0 devnet, chain id 4464. Coins have no value. The chain may reset."><span class="dot off" id="foot-dot"></span><span id="foot-state" data-devnet-state="starting">Igneum 2.0 devnet starting</span></span>
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<div class="nav-group" role="listitem"><button type="button" class="group-btn" id="nav-btn-mine" data-group="mine" aria-expanded="false" aria-controls="nav-panel-mine" aria-haspopup="true">Mine<svg class="icon" viewBox="0 0 24 24" aria-hidden="true"><path d="m7 10 5 5 5-5"/></svg></button></div>
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<a href="/download" class="btn primary small cta" data-nav="download">Download</a>
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<div class="panel-list">
<a href="/miner" data-nav="miner"><b>Ember, the miner</b><span>One click installs the node, the miner and the prover.</span></a>
<a href="/download" data-nav="download"><b>Download</b><span>Windows, macOS, Linux and HiveOS.</span></a>
<a href="/app" data-nav="app"><b>The app</b><span>What you see while the card mines.</span></a>
<a href="/wallet" data-nav="wallet"><b>The wallet</b><span>Your coins. Final means final.</span></a>
<a href="/miners" data-nav="miners"><b>GPU bench table</b><span>Measured rates, card by card.</span></a>
<a href="/dev-fee" data-nav="dev-fee"><b>The dev fee</b><span>The optional one, in full view, off with one flag.</span></a>
<a href="/metamask" data-nav="metamask"><b>Add to MetaMask</b><span>Igneum as a network in your wallet.</span></a>
</div>
</div>
<div class="nav-panel" id="nav-panel-network" data-group="network" role="region" aria-labelledby="nav-btn-network" hidden>
<div class="panel-list">
<a href="/live" data-nav="live"><b>Live devnet</b><span>The chain as it grows, one lane per miner.</span></a>
<a href="/explorer" data-nav="explorer"><b>Explorer</b><span>Look a block or an address up.</span></a>
<a href="/evidence" data-nav="evidence"><b>Evidence</b><span>Every claim and how far it is tested.</span></a>
<a href="/light" data-nav="light"><b>Light wallet</b><span>A balance your browser proves, trusting no node.</span></a>
<a href="/receipt" data-nav="receipt" aria-current="page"><b>Payment receipt</b><span>A receipt any third party re-verifies offline.</span></a>
<a href="/oracle" data-nav="oracle"><b>State oracle on Sepolia</b><span>Balances on the devnet, read from another chain.</span></a>
</div>
</div>
<div class="nav-panel" id="nav-panel-learn" data-group="learn" role="region" aria-labelledby="nav-btn-learn" hidden>
<div class="panel-list">
<a href="/litepaper" data-nav="litepaper"><b>Litepaper</b><span>The design, as published.</span></a>
<a href="/income" data-nav="income"><b>Income</b><span>What your card would mine, from the live network.</span></a>
<a href="/economics" data-nav="economics"><b>Economics</b><span>The emission, the split and the fees, each with its line in the node.</span></a>
<a href="/ledger" data-nav="ledger"><b>Ledger</b><span>Every criticism, answered or conceded.</span></a>
<a href="/claims" data-nav="claims"><b>What Igneum does not claim</b><span>The limits, stated first.</span></a>
<a href="/randomx" data-nav="randomx"><b>Igneum vs RandomX</b><span>What was kept and what was rebuilt for GPUs.</span></a>
<a href="/provenance" data-nav="provenance"><b>Built on the shoulders</b><span>Every borrowed part, credited.</span></a>
</div>
</div>
<div class="nav-panel" id="nav-panel-build" data-group="build" role="region" aria-labelledby="nav-btn-build" hidden>
<div class="panel-list">
<a href="/build" data-nav="build"><b>Build on Igneum</b><span>Chain ids, RPC, a contract in five minutes.</span></a>
<a href="/faucet" data-nav="faucet"><b>Devnet faucet</b><span>10 IGN of devnet coin, once a day.</span></a>
<a href="/swap" data-nav="swap"><b>Swap</b><span>Test tokens on the devnet; every swap is a proven block.</span></a>
<a href="/grants" data-nav="grants"><b>Grants</b><span>Tooling, apps, infrastructure, research.</span></a>
<a href="/compatibility" data-nav="compatibility"><b>Compatibility</b><span>Every row a test run against the devnet.</span></a>
</div>
</div>
</div>
</div>
<div class="nav-sheet" id="nav-sheet" role="dialog" aria-modal="true" aria-label="Menu" hidden>
<div class="sheet-scroll">
<div class="sheet-group"><div class="sheet-head">Mine</div>
<a href="/miner" data-nav="miner"><b>Ember, the miner</b><span>One click installs the node, the miner and the prover.</span></a>
<a href="/download" data-nav="download"><b>Download</b><span>Windows, macOS, Linux and HiveOS.</span></a>
<a href="/app" data-nav="app"><b>The app</b><span>What you see while the card mines.</span></a>
<a href="/wallet" data-nav="wallet"><b>The wallet</b><span>Your coins. Final means final.</span></a>
<a href="/miners" data-nav="miners"><b>GPU bench table</b><span>Measured rates, card by card.</span></a>
<a href="/dev-fee" data-nav="dev-fee"><b>The dev fee</b><span>The optional one, in full view, off with one flag.</span></a>
<a href="/metamask" data-nav="metamask"><b>Add to MetaMask</b><span>Igneum as a network in your wallet.</span></a>
</div>
<div class="sheet-group"><div class="sheet-head">Network</div>
<a href="/live" data-nav="live"><b>Live devnet</b><span>The chain as it grows, one lane per miner.</span></a>
<a href="/explorer" data-nav="explorer"><b>Explorer</b><span>Look a block or an address up.</span></a>
<a href="/evidence" data-nav="evidence"><b>Evidence</b><span>Every claim and how far it is tested.</span></a>
<a href="/light" data-nav="light"><b>Light wallet</b><span>A balance your browser proves, trusting no node.</span></a>
<a href="/receipt" data-nav="receipt" aria-current="page"><b>Payment receipt</b><span>A receipt any third party re-verifies offline.</span></a>
<a href="/oracle" data-nav="oracle"><b>State oracle on Sepolia</b><span>Balances on the devnet, read from another chain.</span></a>
</div>
<div class="sheet-group"><div class="sheet-head">Learn</div>
<a href="/litepaper" data-nav="litepaper"><b>Litepaper</b><span>The design, as published.</span></a>
<a href="/income" data-nav="income"><b>Income</b><span>What your card would mine, from the live network.</span></a>
<a href="/economics" data-nav="economics"><b>Economics</b><span>The emission, the split and the fees, each with its line in the node.</span></a>
<a href="/ledger" data-nav="ledger"><b>Ledger</b><span>Every criticism, answered or conceded.</span></a>
<a href="/claims" data-nav="claims"><b>What Igneum does not claim</b><span>The limits, stated first.</span></a>
<a href="/randomx" data-nav="randomx"><b>Igneum vs RandomX</b><span>What was kept and what was rebuilt for GPUs.</span></a>
<a href="/provenance" data-nav="provenance"><b>Built on the shoulders</b><span>Every borrowed part, credited.</span></a>
</div>
<div class="sheet-group"><div class="sheet-head">Build</div>
<a href="/build" data-nav="build"><b>Build on Igneum</b><span>Chain ids, RPC, a contract in five minutes.</span></a>
<a href="/faucet" data-nav="faucet"><b>Devnet faucet</b><span>10 IGN of devnet coin, once a day.</span></a>
<a href="/swap" data-nav="swap"><b>Swap</b><span>Test tokens on the devnet; every swap is a proven block.</span></a>
<a href="/grants" data-nav="grants"><b>Grants</b><span>Tooling, apps, infrastructure, research.</span></a>
<a href="/compatibility" data-nav="compatibility"><b>Compatibility</b><span>Every row a test run against the devnet.</span></a>
</div>
<div class="sheet-foot">
<a href="/download" class="btn primary big" data-nav="download">Download</a>
<div class="sheet-social"><a href="https://discord.gg/igneum" target="_blank" rel="noopener">Discord</a><a href="https://git.igneum.network/igneum-network/spec" target="_blank" rel="noopener">Source</a><a href="https://www.reddit.com/user/Igneum_network/" target="_blank" rel="noopener">Reddit</a></div>
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<div class="breadcrumb"><a href="/">Igneum</a><span>/</span><span>Payment receipt</span></div>
<div class="eyebrow"><span class="line"></span>Reference app 2 · the devnet, no value</div>
<h1>A receipt any third party re-verifies<span class="accent">.</span></h1>
</div>
<p class="note"><b>A GPU-secured network for Ethereum-compatible applications and verifiable computation.</b> Devnet, no value.</p>
<p class="note">Paste a devnet transaction hash. This tab fetches the raw transaction, the including block's merkle path, every header up to the certified checkpoint and the certificate, then proves inclusion and finality itself. Download the receipt as JSON. Anyone checks it later with a one-file verifier, offline, with no node and no network. Test with the negative cases: <code>tools/reference-apps/light-service/verify.test.mjs</code> (eight payment cases, nine inclusion cases).</p>
<div class="trust"><h3>Which receipt this is</h3><ul>
<li>The page issues one of two receipts and names it on the result, in the file (field <code>kind</code>) and in the offline verifier's output.</li>
<li>A <b>transaction inclusion receipt</b> authenticates that the signed transaction (recipient, amount and data as signed) is included in a block that is finalised. The execution result (status, gas, logs) is carried as the node reported it and labelled so; a transaction can be included and finalised and still have failed.</li>
<li>A <b>payment receipt</b> also authenticates the execution outcome: the transaction's receipt (status success, its logs) sits in the shard receipts trie whose root the proven segment's statement commits to (<code>receipts</code> = keccak over the shard roots, signed by the aggregator inside the carrier block, under the certificate). Asset, recipient and amount are the signed transaction's; the outcome is the authenticated receipt's. It is issued when the transaction executed at a paid segment's last block, which is where the statement commits that block's receipts; otherwise the page says why it issues the inclusion receipt. Per-shard records would cover every block and are the next step once they are paid again.</li>
</ul></div>
<div class="why">
<p><b>Why this only works on a proven chain.</b> Three boundaries hold wherever the proof architecture is explained: proven execution is not finality; EVM compatibility is not Ethereum security; ZK is not privacy. A merchant's receipt is only worth something if the payment cannot be undone and the proof of that fits in a file: here the certificate is a weighted BLS signature by the miners over a checkpoint, and the block holding the payment hashes into that checkpoint's past. On a chain with probabilistic finality a receipt is a guess that ages well; here it is a fact that a file carries.</p>
<p>Source: <code>site/lc/core.js</code> (the checks), <code>site/lc/app.js</code> (this page), <code>tools/reference-apps/receipt/verify-receipt.src.mjs</code> (the one-file verifier, bundled to <code>/lc/verify-receipt.js</code>). Test with the negative cases: <a href="/lc/test">/lc/test</a> in the browser, <code>tools/reference-apps/light-service/verify.test.mjs</code> under Node.</p>
</div>
<section class="card" aria-labelledby="verify">
<h2 id="verify">Get a receipt</h2>
<form class="vform" data-form="receipt" novalidate>
<label for="tx">Transaction hash</label>
<div class="row"><input id="tx" name="tx" inputmode="text" autocomplete="off" spellcheck="false" placeholder="0x…" pattern="^0x[0-9a-fA-F]{64}$"><button class="btn primary" type="submit">Prove it in this tab</button></div>
<div class="vstatus" data-status role="status" aria-live="polite">the devnet, no value. A transaction is final once a certified checkpoint has it in its past, about 30 to 90 s after it executes.</div>
</form>
<div data-result></div>
</section>
<h2 id="offline">Re-verify offline</h2>
<p class="note">The verifier is one file of plain JavaScript with the hashing and curve code inside it: <a href="/lc/verify-receipt.js" download>verify-receipt.js</a>. It runs under Node 18 or later (<code>node verify-receipt.js receipt.json</code>) and prints each check, then <code>VERIFIED</code> or <code>REFUSED</code> with the reason. It fetches nothing. Flip one byte of the file and it is refused: <code>node verify-receipt.js receipt.json --tamper</code> runs that case first so you see the refusal before the verdict.</p>
<h2 id="checked">What the receipts prove</h2>
<ol>
<li>The transaction hash is keccak256 of the raw signed transaction in the file, so the recipient, the amount and the data are the signed ones.</li>
<li>The transaction is a leaf of the including block's <code>hash_merkle_root</code> (BLAKE2b-256 keyed MerkleBranchHash up the path).</li>
<li>Every header from the including block to the certified checkpoint recomputes and links to the next by a direct parent.</li>
<li>The certificate over that checkpoint verifies: the aggregate BLS signature of the signers, the voter order, two thirds of active weight and two thirds of total weight.</li>
</ol>
<p class="note">The payment receipt adds: the record's carrier block up to the checkpoint, the segment record's signature, the shard receipts roots hashing to the statement's commitment, the shard's receipts rebuilding that root with this transaction's receipt at its position. Not proven by either file: the voter table with weights comes from the node (spec 10.1), and the SP1 proof behind the statement is verified by nodes, not here. In the four words below: the inclusion receipt authenticates included and finalised, reports executed and claims nothing about proven; the payment receipt authenticates included, executed, proven and finalised under the trust assumptions stated.</p>
<!-- terms:start -->
<section class="terms" aria-labelledby="terms-head">
<h2 id="terms-head">Four words, used exactly</h2>
<div class="kv">
<div class="k">Included</div><div>The transaction is in a block's body: its hash is a leaf under the block header's <code>hash_merkle_root</code>. Proves the block carries it, nothing about what it did.</div>
<div class="k">Executed</div><div>A node ran it at a chain block and reports a result (status, gas, logs). On these pages an execution result is reported by the node, not authenticated, unless the page says it is.</div>
<div class="k">Proven</div><div>An aggregator's segment record, carried in a block's coinbase and signed with its vote key, commits to the state root after that chain block; nodes check the statement against their own execution before paying it. The SP1 proof behind the statement is verified by nodes, not in the browser or on Sepolia.</div>
<div class="k">Finalised</div><div>A certified checkpoint has the block in its past: an aggregate BLS signature by voters holding two thirds of active weight and at least 17/30 of total weight over the checkpoint, checked here against the voter table the node supplies.</div>
</div>
<p class="note">The same four definitions sit on <a href="/light">/light</a>, <a href="/receipt">/receipt</a> and <a href="/oracle">/oracle</a> (one source: <code>site/partials/terms.html</code>). The devnet, no value.</p>
</section>
<!-- terms:end -->
<p class="asof">the devnet, no value. The chain may reset. A demonstration of the verification path, not a product.</p>
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