{
  "height": 64,
  "block_hash": "6a0ff3f83ed9ad7ff1619cfba9b76f7aa6a85603883aaee370fe958b7a7640e7",
  "status": "confirmed",
  "bitcoin_block_height": 972968,
  "digest": {
    "alg": "sha256",
    "hex": "6a0ff3f83ed9ad7ff1619cfba9b76f7aa6a85603883aaee370fe958b7a7640e7",
    "preimage": "block:{\"at\":\"2026-10-24T18:53:37.142Z\",\"entry_count\":1,\"first_seq\":66,\"height\":64,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":66,\"merkle_root\":\"7961403a86bfc93e735888c03815c314101292b1911d062e3c31b410a1996bcb\",\"prev_hash\":\"6fda7bf75a2b1aaaea3c59d99dc6f5539514e1447f884003b9c3186cb57bc080\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:03:06.797Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add00eba30094b5bdecf051d8c1dbe5582b0a6d6438aac12192b6c5ca01de2123f4090413c41fc29b89e3c3"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:03:06.797Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add00ebd1c24191f2dc9eb0f0bc32ce37a11cd38149596faf63cfe7e494def2ee101f8a58cf74bf9b704dc7"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:03:06.797Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add00ec12f7b65649f643e58e055d2ec4033799e0c4c460ba07703008982a126534120e931441099d09a578"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/64/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."
}