{
  "height": 63,
  "block_hash": "6fda7bf75a2b1aaaea3c59d99dc6f5539514e1447f884003b9c3186cb57bc080",
  "status": "confirmed",
  "bitcoin_block_height": 972968,
  "digest": {
    "alg": "sha256",
    "hex": "6fda7bf75a2b1aaaea3c59d99dc6f5539514e1447f884003b9c3186cb57bc080",
    "preimage": "block:{\"at\":\"2026-10-24T18:48:37.094Z\",\"entry_count\":1,\"first_seq\":65,\"height\":63,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":65,\"merkle_root\":\"95c9cbd6e3e15acdb04bf2bf6ee6fd42fe47bad8560260970440d40a592d2b36\",\"prev_hash\":\"e04838348f244c74669641b055cc6fc76685343306c4b278efc44a17c7da6797\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:53:06.796Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcfe93f98b647b5127a34515a7d8aa739499d15fc06e6ad8dfcd8d466f7275badb6ec2a40b0d3bb8fc9fee"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:53:06.796Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcfe938684678a117fa242252e0ab2e44d7dab2dba286723f704fe3f69912c0e44d8508d7c5695113b0c7d"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:53:06.796Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcfe9454fe386669370376e1d5f7c49cc0a26d20d237e8ff8de5fcdfc39a3e714ddd48a181ba1b5acaa66e"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/63/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."
}