{
  "height": 105,
  "block_hash": "ef49b214a82308e938cd714437c72f88022f420599b7fa22bacfa7bb005bcfc3",
  "status": "confirmed",
  "bitcoin_block_height": 974888,
  "digest": {
    "alg": "sha256",
    "hex": "ef49b214a82308e938cd714437c72f88022f420599b7fa22bacfa7bb005bcfc3",
    "preimage": "block:{\"at\":\"2026-11-07T03:24:15.437Z\",\"entry_count\":3,\"first_seq\":216,\"height\":105,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":218,\"merkle_root\":\"864db9e3dc0c937faca65f10b7be7d20d66a9ac67bbed8d8132371a958bd9651\",\"prev_hash\":\"3ac26fa1ad907488280538fdf04c365b5dec99564cbcefc9ddc5333c1afe2d62\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T03:28:43.476Z",
      "updated_at": "2026-11-07T05:28:43.487Z",
      "bitcoin_block_height": 974888,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee9aee51f77a0bb5758ce8525c38e6ffcb6228b739104ab8aa17048c8a3f9dac0b168b82e6e920e9fffdba"
        },
        {
          "type": "bitcoin",
          "block_height": 974888,
          "merkle_root": "a373ea77dcacd26df989734c2bed34895920c60a915ed91eb73aa06c53238081"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T03:28:43.476Z",
      "updated_at": "2026-11-07T05:28:43.487Z",
      "bitcoin_block_height": 974888,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee9aee627253dad809e49ba91cd2eb7d78fe80947ae3d3e88f2f427433d3e8e80976d00301b656a40ffff5"
        },
        {
          "type": "bitcoin",
          "block_height": 974888,
          "merkle_root": "a373ea77dcacd26df989734c2bed34895920c60a915ed91eb73aa06c53238081"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T03:28:43.476Z",
      "updated_at": "2026-11-07T03:28:43.476Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee9aee1ed87aaa06a6341aba59be25c64e586b20dc2451a78350bcb2acab3deb1270b37ceb0cbdacccb19b"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/105/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."
}