{
  "height": 86,
  "block_hash": "74d12e0372377effbdba450e5e2c6485d407241beda3bde47b6438e322b2dc50",
  "status": "confirmed",
  "bitcoin_block_height": 972975,
  "digest": {
    "alg": "sha256",
    "hex": "74d12e0372377effbdba450e5e2c6485d407241beda3bde47b6438e322b2dc50",
    "preimage": "block:{\"at\":\"2026-10-24T20:42:19.200Z\",\"entry_count\":1,\"first_seq\":89,\"height\":86,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":89,\"merkle_root\":\"13431baf41f0ca2d5ed8cf1e8be1bb3eb6bb4d03bb8bf73b9913b99580bff34a\",\"prev_hash\":\"862489960196af2b99ab41ceb87dc92044a04bbd7f08b1e009568e93e4f96f4d\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:46:48.976Z",
      "updated_at": "2026-10-24T22:09:18.887Z",
      "bitcoin_block_height": 972975,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add193974af66fe130911e77818a78d37bb8d41d69a7c7c87da3391559fa4885582bb743be85479dda61c4a"
        },
        {
          "type": "bitcoin",
          "block_height": 972975,
          "merkle_root": "3eb48eb29389e740eedc53d9738b2325fddc7d0d93043c3050a541b5428ef537"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:46:48.976Z",
      "updated_at": "2026-10-24T22:09:18.887Z",
      "bitcoin_block_height": 972975,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add193990271290c6b83d06ad506b64bbff8c07b0b4ac15d61253a5eef37218b8a985cd74b3e3f19b25de83"
        },
        {
          "type": "bitcoin",
          "block_height": 972975,
          "merkle_root": "3eb48eb29389e740eedc53d9738b2325fddc7d0d93043c3050a541b5428ef537"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:46:48.976Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add193a1eebea551a58b8be0f39f11fa758c9cc592808b854d8d1d603e18d2a6e22250850f2c34b995e0ba7"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/86/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."
}