{
  "height": 48,
  "block_hash": "afc6c374694fd10db604a50db2d7f6b8c68b6201355e05d879be14881bc3d620",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "afc6c374694fd10db604a50db2d7f6b8c68b6201355e05d879be14881bc3d620",
    "preimage": "block:{\"at\":\"2026-11-07T01:06:59.999Z\",\"entry_count\":1,\"first_seq\":130,\"height\":48,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":130,\"merkle_root\":\"c73909eb907c2c2aa457ae17edd14e2f3583e1fc41ac8fc14004c8c20a9446bb\",\"prev_hash\":\"ed602ab400c4eafac9da097cb1ff533a98fa3f4c89c102d28d4e26f42c879c01\",\"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": "6aee7a1f56a7f7619f7cc76014740474c87406ffc85fc28d4c1890b8793617544099d0bc55ca7e683fa9768c"
        },
        {
          "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": "6aee7a1f293d4e51f907b05dc274482665d932d8358fc4141baf1bbd7ce611564ab706a464d0d4f9c19ad9ef"
        },
        {
          "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": "6aee7a1f2a07f89472ad4e9721f106577034a0be4c02be0f6130020aa9f57db3323c0d1cb6ac29e885261937"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/48/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."
}