{
  "height": 45,
  "block_hash": "46f492861fec9033a4d6b5dbec60b11e1f8a1418e05ea8468c21659d359469a0",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "46f492861fec9033a4d6b5dbec60b11e1f8a1418e05ea8468c21659d359469a0",
    "preimage": "block:{\"at\":\"2026-11-07T00:59:14.960Z\",\"entry_count\":2,\"first_seq\":125,\"height\":45,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":126,\"merkle_root\":\"79636da797ab08abe976424444c4b6ac220e4e71129f988a12bee5d04c8e6173\",\"prev_hash\":\"985eb038f9cb32a9dee163097240858b703e1c9ab5793439d3b9cb5a3bf69e16\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:08:43.458Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee7a1ca2fd5583de7a540d84709899553f26c778e0ccf4cca8916d8f392e1d8a967a21b8d83500b5fb4671"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:08:43.458Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee7a1cc880a61970de2ae4b4abd8d8f6e815fc1cce153c391a4a8b0b89904987e2fea91f1cafad35401b55"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:08:43.458Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee7a1ce81215dadbe790cef8288744a9e74fc1977937c8c439ed6c0b6d5bae54fb8735b2092bb75d1b6903"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/45/anchor.ots",
  "how_to_verify": "Download the .ots proof and run `ots verify -d <block_hash> <file>.ots` with the OpenTimestamps client, which checks the Bitcoin attestation against Bitcoin block headers. The digest is the block hash: sha256 of digest.preimage, the text \"block:\" followed by the canonical block header, which is the same header the issuer signs."
}