{
  "height": 85,
  "block_hash": "862489960196af2b99ab41ceb87dc92044a04bbd7f08b1e009568e93e4f96f4d",
  "status": "confirmed",
  "bitcoin_block_height": 972975,
  "digest": {
    "alg": "sha256",
    "hex": "862489960196af2b99ab41ceb87dc92044a04bbd7f08b1e009568e93e4f96f4d",
    "preimage": "block:{\"at\":\"2026-10-24T20:36:19.247Z\",\"entry_count\":1,\"first_seq\":88,\"height\":85,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":88,\"merkle_root\":\"041e1c037f0a9ed4252dafd24f1be2e4685f474e92eefdea6c8b8ff9653966a1\",\"prev_hash\":\"8e2d58deb8b900a38d5ae94368d0e29cf18e2c6332b0746b429f8c1dcccbf5c3\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:37:18.990Z",
      "updated_at": "2026-10-24T22:09:18.887Z",
      "bitcoin_block_height": 972975,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add170189504695e9b6e42299f2216df35edf67e78526e4e12b8696f543217502d9c423034aaee3903e0e5f"
        },
        {
          "type": "bitcoin",
          "block_height": 972975,
          "merkle_root": "3eb48eb29389e740eedc53d9738b2325fddc7d0d93043c3050a541b5428ef537"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:37:18.990Z",
      "updated_at": "2026-10-24T22:09:18.887Z",
      "bitcoin_block_height": 972975,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add170020d86dd10a99d143a1c4cee52fdf280a3ee4f462d0f293ef7dbbfb3265e9bd7dcb9845da544562ef"
        },
        {
          "type": "bitcoin",
          "block_height": 972975,
          "merkle_root": "3eb48eb29389e740eedc53d9738b2325fddc7d0d93043c3050a541b5428ef537"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:37:18.990Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add17005e741ed6db3e149f89720ee3508663ef7ec1c069e63df91a70f8a9b0c7b124c8631b72e0cc1ecec1"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/85/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."
}