{
  "height": 78,
  "block_hash": "48247760b10e701ab53e15bca95846415ba1c88b9f9599ffc81086f21f5e60c1",
  "status": "confirmed",
  "bitcoin_block_height": 972970,
  "digest": {
    "alg": "sha256",
    "hex": "48247760b10e701ab53e15bca95846415ba1c88b9f9599ffc81086f21f5e60c1",
    "preimage": "block:{\"at\":\"2026-10-24T20:03:37.694Z\",\"entry_count\":1,\"first_seq\":80,\"height\":78,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":80,\"merkle_root\":\"a58197ecfc70108d3b81096a22ba517c608c63e5b1730b291b094364571d190c\",\"prev_hash\":\"4cfd3e4140b484c3fc5d441a0bbf6e32f6dfa34e8d8377673fca7788a0a47365\",\"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": "6add10e8249adceb7a9cd6d225a6afd14256090aa8113d78cc5f166d64ef8ee0d4ae5206262cc424a2f3af42"
        },
        {
          "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": "6add10e723fd1223d99cff9807da125aae8fc61bcbf7ae17a1599e6298c6830dcfe91d271223ad068e7905cc"
        },
        {
          "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": "6add10e79f41828896d9b9ec6596691891a95ac76a9074c78759c20a24aebb692d470f03f1cdeb9f9525c8fb"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/78/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."
}