{
  "height": 103,
  "block_hash": "fffc9781e955c8b673cf346c934efc3b04ab13178a6ab39b35e83573f829f17e",
  "status": "confirmed",
  "bitcoin_block_height": 972982,
  "digest": {
    "alg": "sha256",
    "hex": "fffc9781e955c8b673cf346c934efc3b04ab13178a6ab39b35e83573f829f17e",
    "preimage": "block:{\"at\":\"2026-10-24T22:07:52.622Z\",\"entry_count\":1,\"first_seq\":106,\"height\":103,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":106,\"merkle_root\":\"042828eeaf1c62d3da460533b7af44d60bffb764594f022a743d621d32e22282\",\"prev_hash\":\"4508207d396fc1a07683de2cc401ca37a82b600016575cf59e5d4ed382ddbfdd\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T22:09:18.887Z",
      "updated_at": "2026-10-24T23:44:06.863Z",
      "bitcoin_block_height": 972982,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add2c8fb76787be79a2c5e174153075a110fd83117dd80883f7da6fc60e396f8337dc302ef5dc074a23fcdf"
        },
        {
          "type": "bitcoin",
          "block_height": 972982,
          "merkle_root": "4c99dddccb05ff6394193624edeedc186bccaa073a9bcae6d83f1f485bcee966"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T22:09:18.887Z",
      "updated_at": "2026-10-24T23:44:06.863Z",
      "bitcoin_block_height": 972982,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add2c8fb93667e391ac19d2c90dc2df05081186f77d1f4ffc13778b39bbfd14b6106058639a3c2d29671a83"
        },
        {
          "type": "bitcoin",
          "block_height": 972982,
          "merkle_root": "4c99dddccb05ff6394193624edeedc186bccaa073a9bcae6d83f1f485bcee966"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T22:09:18.887Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add2c8fb2ffce720da060923d229e195f9d5a503c9f888095d98803cdeadd5cb3344af6d0f239376ea8b822"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/103/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."
}