{
  "height": 74,
  "block_hash": "fe8aca317d3933d59d55a2707a532ba2b06b86c58697416934c5b7a994a9a537",
  "status": "confirmed",
  "bitcoin_block_height": 972968,
  "digest": {
    "alg": "sha256",
    "hex": "fe8aca317d3933d59d55a2707a532ba2b06b86c58697416934c5b7a994a9a537",
    "preimage": "block:{\"at\":\"2026-10-24T19:43:37.558Z\",\"entry_count\":1,\"first_seq\":76,\"height\":74,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":76,\"merkle_root\":\"81adb09261b446c4f3d91949e64c2d010fac960ecec298e760f8612e0d2a34cc\",\"prev_hash\":\"bcf3afd2f6da2310d2ffc607add454a55b54df16297a66242041ef5bee79567d\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:53:06.806Z",
      "updated_at": "2026-10-24T20:56:48.978Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add0ca48a4435cb2b8f490c7185a41db93d61755b514297afec44f813da9da6fabbf4c290dcc5b2e4d6282e"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:53:06.806Z",
      "updated_at": "2026-10-24T20:56:48.978Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add0ca3efec4ca5585718dd0c801e4d5b1e2694a749c8aa5a263fb07996f8e183e160b5ea521d3659ad8336"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:53:06.806Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add0ca39c43d79ac24cce1fc12b07d8ebbdf9c3e7e91247df541dfbc10dcd3ab46ff100196f3d4c80efff28"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/74/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."
}