{
  "height": 19,
  "block_hash": "2f5bc16b42c13d99cf69ae592b7a817c1bf38a2e9af71fff9f558fad1e7a21e1",
  "status": "confirmed",
  "bitcoin_block_height": 972850,
  "digest": {
    "alg": "sha256",
    "hex": "2f5bc16b42c13d99cf69ae592b7a817c1bf38a2e9af71fff9f558fad1e7a21e1",
    "preimage": "block:{\"at\":\"2026-10-23T23:31:00.960Z\",\"entry_count\":1,\"first_seq\":21,\"height\":19,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":21,\"merkle_root\":\"28183a40f9ea0d817e2a34c79ffc7220908634d729c3f2150409c6ae8ffd1eb1\",\"prev_hash\":\"de1a5dd1067d32d4930794bea615cb1b918042db829fb6500ed1a821e4c90c38\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-23T23:31:30.983Z",
      "updated_at": "2026-10-24T01:37:59.835Z",
      "bitcoin_block_height": 972850,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adbee54a7e71aa9f5dcc3ade2778500b4c2a2a6803b11afc6cce5cd42f563626afe7290c878b955cbad2759"
        },
        {
          "type": "bitcoin",
          "block_height": 972850,
          "merkle_root": "bfb0efe3c54ef54dc8a7101d028b93e93be3b6e8e58fffd7ffd6cd5d27deb31c"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-23T23:31:30.983Z",
      "updated_at": "2026-10-24T01:37:59.835Z",
      "bitcoin_block_height": 972850,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adbee539bf6307d42dabce9e0262a01c8ba5434fb34e7eb41aef7786ef3eac3a6d1e533fafa2ebfaa909951"
        },
        {
          "type": "bitcoin",
          "block_height": 972850,
          "merkle_root": "bfb0efe3c54ef54dc8a7101d028b93e93be3b6e8e58fffd7ffd6cd5d27deb31c"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-23T23:31:30.983Z",
      "updated_at": "2026-10-24T04:53:42.413Z",
      "bitcoin_block_height": 972871,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adbee548d7b04fb886f256d9163bbf994b731241523bcdddb244a1599ed13ef6f4414612f0621beea6e03e9"
        },
        {
          "type": "bitcoin",
          "block_height": 972871,
          "merkle_root": "96023e29396199d7f998b73198fe082536fa2b29b84bd1f8307762231f94e59d"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/19/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."
}