{
  "height": 77,
  "block_hash": "4cfd3e4140b484c3fc5d441a0bbf6e32f6dfa34e8d8377673fca7788a0a47365",
  "status": "confirmed",
  "bitcoin_block_height": 972970,
  "digest": {
    "alg": "sha256",
    "hex": "4cfd3e4140b484c3fc5d441a0bbf6e32f6dfa34e8d8377673fca7788a0a47365",
    "preimage": "block:{\"at\":\"2026-10-24T19:58:37.668Z\",\"entry_count\":1,\"first_seq\":79,\"height\":77,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":79,\"merkle_root\":\"819e8632522477ab1f794b5d8c2f5ee39c3b6e7f57cb0ec119983b3eedcfbfb9\",\"prev_hash\":\"494aad86debc0719cb9353b850c7245ed5de4d1c14e0aedadc6f679e1d3787fd\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:03:06.808Z",
      "updated_at": "2026-10-24T21:06:48.979Z",
      "bitcoin_block_height": 972970,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add0efd038195413a8d5c8cc9e5fe5f48a9a8d009ec3f8c9a7bd8485d98b5930760d46c19c7bec2e499e90f"
        },
        {
          "type": "bitcoin",
          "block_height": 972970,
          "merkle_root": "981994db85d44894e89054822a38e892b6dfa0f4a87277463faafcbbd05de202"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:03:06.808Z",
      "updated_at": "2026-10-24T21:06:48.979Z",
      "bitcoin_block_height": 972970,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add0efce799aceec5d0ebb0eff074004ffd9090c1b42eea7462f53a8f4f698a6544ada93f3699c3f00154b0"
        },
        {
          "type": "bitcoin",
          "block_height": 972970,
          "merkle_root": "981994db85d44894e89054822a38e892b6dfa0f4a87277463faafcbbd05de202"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:03:06.808Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add0efd605a840d873c37abb9c3a2a0756fa70d9eaf35628efffcb321e6b581ae64d9196725743eef0b312e"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/77/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."
}