{
  "height": 157,
  "block_hash": "fd680805e16ef02f6234d0930866ba3f0c74ac31ce948f5f0776fe8e0cb9232e",
  "status": "confirmed",
  "bitcoin_block_height": 973008,
  "digest": {
    "alg": "sha256",
    "hex": "fd680805e16ef02f6234d0930866ba3f0c74ac31ce948f5f0776fe8e0cb9232e",
    "preimage": "block:{\"at\":\"2026-10-25T02:45:02.533Z\",\"entry_count\":2,\"first_seq\":186,\"height\":157,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":187,\"merkle_root\":\"38ac2a11830dcd57450d69ac23ca70ee3d32672085ffe9c4fc8db09a9ba0c841\",\"prev_hash\":\"ca3cfed9b1e5dd06a98b00e07bb84be5abb558eba1bcd566c9d5a77baca25a32\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:49:17.524Z",
      "updated_at": "2026-10-25T04:40:53.358Z",
      "bitcoin_block_height": 973008,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add6e2daf355db9d8ee56f9c94511750a4ac1971706f191c041bbe40ef10630f251897c16e43edd52f48df4"
        },
        {
          "type": "bitcoin",
          "block_height": 973008,
          "merkle_root": "b4c8cb5368bdd419ca721c6f8a13cee3e4a5e44754475ff13de245ca3c87202b"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:49:17.524Z",
      "updated_at": "2026-10-25T04:40:53.358Z",
      "bitcoin_block_height": 973008,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add6e2d489f07a48320c673fcef7a56eb67f96b094365be53e53c38ed4e1c4c0ee2b97919c077b28421a933"
        },
        {
          "type": "bitcoin",
          "block_height": 973008,
          "merkle_root": "b4c8cb5368bdd419ca721c6f8a13cee3e4a5e44754475ff13de245ca3c87202b"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T02:49:17.524Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add6e2e41369452375b60ffc3654a7cec7bf6b68772d0c986ce2170f2023fbf57aa9e217e2b06971737eea0"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/157/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."
}