{
  "height": 66,
  "block_hash": "c04f96262bc0e5072a528fb99a52e33dc28371e6306aed93a4c726c083a12ebd",
  "status": "confirmed",
  "bitcoin_block_height": 974880,
  "digest": {
    "alg": "sha256",
    "hex": "c04f96262bc0e5072a528fb99a52e33dc28371e6306aed93a4c726c083a12ebd",
    "preimage": "block:{\"at\":\"2026-11-07T01:49:15.179Z\",\"entry_count\":2,\"first_seq\":157,\"height\":66,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":158,\"merkle_root\":\"1ba62a77f3f5248a6572fdb29cab693f5da109bded9a6d007ce3da2d4dab7659\",\"prev_hash\":\"e2d4b396f588b491b183ca35d23cf728995be76b33683ff739b1cf417e168ad4\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:58:43.462Z",
      "updated_at": "2026-11-07T03:58:43.477Z",
      "bitcoin_block_height": 974880,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee85d339f7b07872c2419c1f60e446916ee654310b97757e6031228c777129d0d9a8dee931578ef41eacf1"
        },
        {
          "type": "bitcoin",
          "block_height": 974880,
          "merkle_root": "e20917e92c25ba0bebbc60b5b7fe48f0ee84f05c3eb4987c3107d249f2c7113d"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:58:43.462Z",
      "updated_at": "2026-11-07T04:58:43.484Z",
      "bitcoin_block_height": 974883,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee85d45c3fc9e2bff5db820c6b575ac9bf5012a97eb41b687a9ba5c8f80805d506fbe653c7a103ebffbe83"
        },
        {
          "type": "bitcoin",
          "block_height": 974883,
          "merkle_root": "79abb9dd33baad0a1ff37045cc779f6fe1b133a7037999fbd2c996ad78e43b90"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T01:58:43.462Z",
      "updated_at": "2026-11-07T01:58:43.462Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee85d432e7bc591c238234166e42b181a1ce4f4796848cee7a37e5bfa0ee865f1868ac6621f0de14043423"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/66/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."
}