{
  "height": 73,
  "block_hash": "bcf3afd2f6da2310d2ffc607add454a55b54df16297a66242041ef5bee79567d",
  "status": "confirmed",
  "bitcoin_block_height": 972968,
  "digest": {
    "alg": "sha256",
    "hex": "bcf3afd2f6da2310d2ffc607add454a55b54df16297a66242041ef5bee79567d",
    "preimage": "block:{\"at\":\"2026-10-24T19:38:37.537Z\",\"entry_count\":1,\"first_seq\":75,\"height\":73,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":75,\"merkle_root\":\"cf3aff6b5027205aa622458102035383e56f561beecfcbc68997b79cdc5a517e\",\"prev_hash\":\"9f5ff8ea0f31605ca3bb9f8da8098543041492c4e80e13258c7e2ccaa07893e8\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:43:06.805Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add0a4c494c882f2b70aacaedd84acf606dd94fa3566c29d8ac520dd2cabe723f0398275862d0f4fb2da1ac"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:43:06.805Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add0a4c960e4222965c9533de939542080d20d784905b506b3ac7bbbcab19490049256f9b329215cc9b10c6"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:43:06.805Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add0a4d7e27519b5d6fc5403e90ecba3858bbcba2d3587b14e2dedca21faa36a0efa714742ee2a10800d32e"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/73/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."
}