{
  "height": 91,
  "block_hash": "a0e398dfae6bddba99ef122d9804d5ef2a1ea2f221d38671448b2f4d9c50e08c",
  "status": "confirmed",
  "bitcoin_block_height": 972978,
  "digest": {
    "alg": "sha256",
    "hex": "a0e398dfae6bddba99ef122d9804d5ef2a1ea2f221d38671448b2f4d9c50e08c",
    "preimage": "block:{\"at\":\"2026-10-24T21:07:19.617Z\",\"entry_count\":1,\"first_seq\":94,\"height\":91,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":94,\"merkle_root\":\"6b5427ae303804e9510401173354e581e6ce68217ada9227a83ead5035c87f76\",\"prev_hash\":\"fd54b6c924be889d9be6a93e12bc3c6c66b842a85fc0a3d7e6c16bcaf435e8d3\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T21:16:48.980Z",
      "updated_at": "2026-10-24T22:38:37.669Z",
      "bitcoin_block_height": 972978,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add20410a9a521289ef290ce249346f0dec5dad33bea02224969f3ef4fa4e4e7d384eed1f2cb501d1df4773"
        },
        {
          "type": "bitcoin",
          "block_height": 972978,
          "merkle_root": "d210051f3445c39bbf32fb4497d94f03b1526298585065034c1aa7d28ddfd046"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T21:16:48.980Z",
      "updated_at": "2026-10-24T22:38:37.669Z",
      "bitcoin_block_height": 972978,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add20413a4c50e6b8b5dc63553c6dac4fb74b55ec82c0a1bb76105d473f1a3f7cc7eacff5390acddd09e99d"
        },
        {
          "type": "bitcoin",
          "block_height": 972978,
          "merkle_root": "d210051f3445c39bbf32fb4497d94f03b1526298585065034c1aa7d28ddfd046"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T21:16:48.980Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add20415ce42c90633783b7f9fcdd338f736eb9464f2f0dd9c8c9a3d29c4d73e6a1b1ea29dbace424c25684"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/91/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."
}