{
  "height": 79,
  "block_hash": "ac31800997abbf1cb9acf932633d3f09118fe1a1be94f44aa0c9d3e1b28d05ba",
  "status": "confirmed",
  "bitcoin_block_height": 972970,
  "digest": {
    "alg": "sha256",
    "hex": "ac31800997abbf1cb9acf932633d3f09118fe1a1be94f44aa0c9d3e1b28d05ba",
    "preimage": "block:{\"at\":\"2026-10-24T20:08:37.714Z\",\"entry_count\":1,\"first_seq\":81,\"height\":79,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":81,\"merkle_root\":\"40bebd9fea9b6a80d1510fe1105290e973132fe40123c5e6620f76899fb20549\",\"prev_hash\":\"48247760b10e701ab53e15bca95846415ba1c88b9f9599ffc81086f21f5e60c1\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:11:18.860Z",
      "updated_at": "2026-10-24T21:16:48.980Z",
      "bitcoin_block_height": 972970,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add10e9e8cac1fe876858e479adef35af1ca05fb984c2871cf1cc13c6b0420ba8d981e6b45cf4957553cb9f"
        },
        {
          "type": "bitcoin",
          "block_height": 972970,
          "merkle_root": "981994db85d44894e89054822a38e892b6dfa0f4a87277463faafcbbd05de202"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:11:18.860Z",
      "updated_at": "2026-10-24T21:16:48.980Z",
      "bitcoin_block_height": 972970,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add10e89495c611cadc508ccb8f4fde0d39153133ddd83123548df71080074701bfd96bae10cbca5b7c3982"
        },
        {
          "type": "bitcoin",
          "block_height": 972970,
          "merkle_root": "981994db85d44894e89054822a38e892b6dfa0f4a87277463faafcbbd05de202"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:11:18.860Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add10e81b6a085c9f4554fa03bfaeee5b2cfbd36b1b8feda9f4f76831e1b4bec6417dc8e5520338ab4d5b53"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/79/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."
}