{
  "height": 9,
  "block_hash": "1147e6b088d9b71e7e67aa37c8651efdd40ed17a1e3fbf35758da40f56227509",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "1147e6b088d9b71e7e67aa37c8651efdd40ed17a1e3fbf35758da40f56227509",
    "preimage": "block:{\"at\":\"2026-11-06T22:50:18.497Z\",\"entry_count\":2,\"first_seq\":62,\"height\":9,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":63,\"merkle_root\":\"3a0c522ece95d80c095cfa6e75d9a36cbddf1205dfd944070f6527e7a44d0454\",\"prev_hash\":\"8572da23d5439400df806a3016eb2cd5f80121dc739c0c9c694af4e56e9c473d\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:54:47.911Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee5ab939a0080d50d5a4f4cf089c150ec4498eea8519ca66f7b9d7bcd4974cc3920ffa8567606b63d6bc2c"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:54:47.911Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee5aba28999067194b46d47df94d1da1aba8cc7c6a917e6e108b736be99cb82b70d273a56dd186fb3bcb4a"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:54:47.911Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee5aba40278bd4c8c64539e9fdd3f8cf28caaa0eaf5b1d043e9d713671575aa74607906c27529c842af349"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/9/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."
}