{
  "height": 59,
  "block_hash": "6dc1f3ccffb923232d39277c532c6888f4c65467f1c61d0b9c1f86f693edd1b3",
  "status": "confirmed",
  "bitcoin_block_height": 974877,
  "digest": {
    "alg": "sha256",
    "hex": "6dc1f3ccffb923232d39277c532c6888f4c65467f1c61d0b9c1f86f693edd1b3",
    "preimage": "block:{\"at\":\"2026-11-07T01:34:15.128Z\",\"entry_count\":2,\"first_seq\":147,\"height\":59,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":148,\"merkle_root\":\"94885543fcc84a0a77bee79c1b3f177768cbb751f8988ca16f02780e691486d7\",\"prev_hash\":\"7a8203b97bd804615522c5e71cb6be89fef5322344e2ca88c5497372615b0bf9\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:38:43.460Z",
      "updated_at": "2026-11-07T04:38:43.483Z",
      "bitcoin_block_height": 974880,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee81268dd21664e47a22d6ad054c56f4d0ca0e82ec6d49b006a9e691e14be24a94e1e2990976f703937d5e"
        },
        {
          "type": "bitcoin",
          "block_height": 974880,
          "merkle_root": "e20917e92c25ba0bebbc60b5b7fe48f0ee84f05c3eb4987c3107d249f2c7113d"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:38:43.460Z",
      "updated_at": "2026-11-07T04:38:43.483Z",
      "bitcoin_block_height": 974883,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee81266892f9b5972d8caff58e4e4be51203ff4d015c419b52d32ba4b90c3b0169a2af239f3d4c7116a4d9"
        },
        {
          "type": "bitcoin",
          "block_height": 974883,
          "merkle_root": "79abb9dd33baad0a1ff37045cc779f6fe1b133a7037999fbd2c996ad78e43b90"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:38:43.460Z",
      "updated_at": "2026-11-07T03:38:43.477Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee8126439b85507a8b2f8e145babfe7825294156ba0ad8a3ff2da899c0506128b5bd60fb566943f21b375c"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/59/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."
}