{
  "proofVersion": 1,
  "generatedAt": "2026-09-07T22:20:17.482Z",
  "block": {
    "formatVersion": 1,
    "index": 22,
    "timestamp": "2026-09-07T19:07:53.692Z",
    "previousHash": "577330b89d10622a3ceb995c0b67713af8a045e1acf7aebba8a744b153cec923",
    "entry": {
      "kind": "seal",
      "title": "Demo video: Seal a document",
      "author": "Stefania Overman",
      "statement": "Official Heartwood Library demonstration video, published on the @HeartwoodLibrary YouTube channel. Any copy of the file can be verified against this fingerprint, forever.",
      "statementHash": "ef4ff2ccf8d6e29fb2141ea10eb4fd56021e173c0dce506702400f30a0d17ec4",
      "documentHash": "ddf99b1b33aa0fafd940d65c5e7155cc70a8bab374fb338da9e669cd23b08828",
      "documentName": "demo3-seal-a-document.mp4",
      "documentData": null,
      "documentType": null,
      "authorKeyId": "3391cebb120892c6",
      "signature": "8wu7wfaO7u3JjXSqre5vBvVTpfdep7g4NJ0j4gKrRZPJiSurxdVH7uHZ7Vduf6XIrWSgSw25NEhuFUelwFeoBQ=="
    },
    "hash": "1e5ce8b7ba29ce9c31d6e600f32b36f5983e6a8d0930ff107ea5883b4613f094"
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  "author": {
    "keyId": "3391cebb120892c6",
    "name": "Stefania Overman",
    "publicKeyHex": "302a300506032b657003210022a275e5bcc5457c0b7b60b8e20931a1e3e9e716cb3bb0d56f8c1f2eb45496d2",
    "activeNow": true
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  "signed": true,
  "tip": {
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    "hash": "2b3bc80bf9fce04a32c1362518157c00d013ce4da263ba8e535a5d9f0bfa57b6"
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  "recipes": {
    "canonicalJson": "JSON with object keys sorted recursively, no whitespace",
    "blockHash": "sha256 hex of canonicalJson({entry, formatVersion, index, previousHash, timestamp})",
    "signature": "Ed25519, base64, over canonicalJson({entry, index, previousHash}) where entry omits its signature field",
    "keyId": "first 16 hex chars of sha256 of publicKeyHex as utf8 text",
    "contentHash": "sha256 hex of the utf8 content text (articles, comments)",
    "statementHash": "sha256 hex of the utf8 statement text (document seals)",
    "documentHash": "sha256 hex of the raw document bytes (document seals)"
  }
}