{
  "height": 39,
  "block_hash": "9269f3edc17607a4b49b3a433a5c6a5ca0f1c8b4215e2137f93e3c8729304a99",
  "status": "confirmed",
  "bitcoin_block_height": 972955,
  "digest": {
    "alg": "sha256",
    "hex": "9269f3edc17607a4b49b3a433a5c6a5ca0f1c8b4215e2137f93e3c8729304a99",
    "preimage": "block:{\"at\":\"2026-10-24T16:41:48.189Z\",\"entry_count\":1,\"first_seq\":41,\"height\":39,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":41,\"merkle_root\":\"8e8fe08ba0ebf639dc4a0b969dc049935e3fb7498c1189ae04a1524844a7f47e\",\"prev_hash\":\"57fe466b2ca71f303e4734d87067a229e4d70b519306a190c19a8a973666a8dc\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:56:17.962Z",
      "updated_at": "2026-10-24T18:43:36.793Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adce33341f271b9158a0bad4702c5be621b45f12b3ad29ab85a712d541550aec1243e1ec782cdb30ce5922b"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:46:17.960Z",
      "updated_at": "2026-10-24T18:43:36.793Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adce0dbb1b8a26e330db88ace96d55f972f6383c38b817d99af4c0aad958901eede19bb3d0e3f4a4921564a"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:46:17.960Z",
      "updated_at": "2026-10-24T19:53:06.806Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adce0dc1ce5c2c4e7d355683eb49c66f46a3f6ce50d65c838c0b3346af03763dd33f4b531f6425f376c5c96"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/39/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."
}