{
  "height": 80,
  "block_hash": "7aa3f8d7ca94e18f19eb3ad84e78157e49aca2eaec910d9007a12385aa5c4a67",
  "status": "confirmed",
  "bitcoin_block_height": 972970,
  "digest": {
    "alg": "sha256",
    "hex": "7aa3f8d7ca94e18f19eb3ad84e78157e49aca2eaec910d9007a12385aa5c4a67",
    "preimage": "block:{\"at\":\"2026-10-24T20:13:19.028Z\",\"entry_count\":2,\"first_seq\":82,\"height\":80,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":83,\"merkle_root\":\"baf4bef3e8f2c83702fbe871aac85cbe9e4d1d390dd938ce6a79f7f0c1ce8d8a\",\"prev_hash\":\"ac31800997abbf1cb9acf932633d3f09118fe1a1be94f44aa0c9d3e1b28d05ba\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:20:48.844Z",
      "updated_at": "2026-10-24T21:26:48.983Z",
      "bitcoin_block_height": 972970,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add1321cf5e9279e01e8ff646f9c0e01a01a46a12d9f48e684de79682449d1a044c72132c27ddb4567fd63b"
        },
        {
          "type": "bitcoin",
          "block_height": 972970,
          "merkle_root": "981994db85d44894e89054822a38e892b6dfa0f4a87277463faafcbbd05de202"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:20:48.844Z",
      "updated_at": "2026-10-24T21:26:48.983Z",
      "bitcoin_block_height": 972970,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add1321b7673ddafdbdef1b95e411a426b00dc5dfba9b45c5558842bb61c203700df3f3ff03e697946424f8"
        },
        {
          "type": "bitcoin",
          "block_height": 972970,
          "merkle_root": "981994db85d44894e89054822a38e892b6dfa0f4a87277463faafcbbd05de202"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:20:48.844Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add13221db97b4ba7f741e429bbf43bfef52092cbae6a2e8789301fee6247ea2d837ec9603f9c339c2f4195"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/80/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."
}