{
  "height": 4,
  "block_hash": "b908636329aecd82ea0540bb171d38dc573ff7fe892540678c1089f7d95c6cf3",
  "status": "confirmed",
  "bitcoin_block_height": 971434,
  "digest": {
    "alg": "sha256",
    "hex": "b908636329aecd82ea0540bb171d38dc573ff7fe892540678c1089f7d95c6cf3",
    "preimage": "block:{\"at\":\"2026-10-14T16:22:33.677Z\",\"entry_count\":1,\"first_seq\":6,\"height\":4,\"key_id\":\"key_f6a85f595bce8b9f\",\"last_seq\":6,\"merkle_root\":\"a6ed081130cc1c486cf980784d42ce639f96644b71265b149d43b13da2ff2a27\",\"prev_hash\":\"d9a472f122c7a6c113b4272fa3944cc7ccd0929613be70f525c88359618d73ce\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-14T16:27:11.733Z",
      "updated_at": "2026-10-14T17:36:05.840Z",
      "bitcoin_block_height": 971434,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6acfad6027994e30188facc16526151114a893bc8ce01b34722706fa25d678abfb75ae8a0db5992f14f3f579"
        },
        {
          "type": "bitcoin",
          "block_height": 971434,
          "merkle_root": "8b95567a5e7230bd3bb7b1231c50d8f5902bc8adbc2411a75a2da0a6f9f70e4a"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-14T16:27:11.733Z",
      "updated_at": "2026-10-14T17:36:05.840Z",
      "bitcoin_block_height": 971434,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6acfad600acd679e7e907add6fca0eabec1104b1c0111a38fa080f8ad0fbe15791c5a86c14f6a66ad0f54f9a"
        },
        {
          "type": "bitcoin",
          "block_height": 971434,
          "merkle_root": "8b95567a5e7230bd3bb7b1231c50d8f5902bc8adbc2411a75a2da0a6f9f70e4a"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-14T16:27:11.733Z",
      "updated_at": "2026-10-14T20:36:05.992Z",
      "bitcoin_block_height": 971452,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6acfad60bb4d0483fdcd4855264ac23283b8652725cdd91eb8d9098d74007a381304b02c8e582ef7875e2872"
        },
        {
          "type": "bitcoin",
          "block_height": 971452,
          "merkle_root": "bb16b9046e4f11363c79a8ab588f23385aefea305764a24e3c13b31fd109e672"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/4/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."
}