{
  "height": 87,
  "block_hash": "0c78b37da6d905ca58cab9e1cccef50e76efa34f058bb296cd8159a1c0982b35",
  "status": "confirmed",
  "bitcoin_block_height": 972976,
  "digest": {
    "alg": "sha256",
    "hex": "0c78b37da6d905ca58cab9e1cccef50e76efa34f058bb296cd8159a1c0982b35",
    "preimage": "block:{\"at\":\"2026-10-24T20:47:19.225Z\",\"entry_count\":1,\"first_seq\":90,\"height\":87,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":90,\"merkle_root\":\"0c341a2d49ee9d6d1273eadc31eeaf95b597cb7472103ab2563b3ae912a5f146\",\"prev_hash\":\"74d12e0372377effbdba450e5e2c6485d407241beda3bde47b6438e322b2dc50\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:56:48.978Z",
      "updated_at": "2026-10-24T22:38:37.669Z",
      "bitcoin_block_height": 972976,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add1b9133aa616d716c2d783f4bf80294dfc87d95bf76d1e37cd95158935fae4dc59a62a5b263995ec79757"
        },
        {
          "type": "bitcoin",
          "block_height": 972976,
          "merkle_root": "327f3f74198d07fbddd3e6d92f719c3637f011825c131f919bc09961a99b60c9"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:56:48.978Z",
      "updated_at": "2026-10-24T22:38:37.669Z",
      "bitcoin_block_height": 972976,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add1b91eb50bdc05c209380c0fc6cb8bb191b9d5c47776f84b01eb9467d10d4c920a5fead40d2d4d68509f0"
        },
        {
          "type": "bitcoin",
          "block_height": 972976,
          "merkle_root": "327f3f74198d07fbddd3e6d92f719c3637f011825c131f919bc09961a99b60c9"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T20:56:48.978Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add1b92aa0e1939c8b9fb23343510c739166a44a869147085d5036dcf086e91e11fee21f9452710810c547b"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/87/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."
}