{
  "height": 12,
  "block_hash": "1c6f403c9eb8a7d17e62d6903fe7afb85c2f0a6991591ecb3f739ca2672e4f9f",
  "status": "confirmed",
  "bitcoin_block_height": 972122,
  "digest": {
    "alg": "sha256",
    "hex": "1c6f403c9eb8a7d17e62d6903fe7afb85c2f0a6991591ecb3f739ca2672e4f9f",
    "preimage": "block:{\"at\":\"2026-10-19T07:44:56.726Z\",\"entry_count\":1,\"first_seq\":14,\"height\":12,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":14,\"merkle_root\":\"65c9375af97aa8e6db43e233c11522a740b677b77aca93e3015c8631d60e7099\",\"prev_hash\":\"d8eb70dbf8489cc62584327345cb03f4191b4534be8153f47ec347acbea98720\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-19T07:50:55.929Z",
      "updated_at": "2026-10-19T09:50:55.957Z",
      "bitcoin_block_height": 972122,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6ad5cbe005b55bc536890d0cd5dead4c25564727079687bdae456ef39ea113f77620cb16e746df9624bf3263"
        },
        {
          "type": "bitcoin",
          "block_height": 972122,
          "merkle_root": "9febf6a47ce3de4f3431ea047a4b8031ebe40d777af2b89bd0f20f5f8bcfce3b"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-19T07:50:55.929Z",
      "updated_at": "2026-10-19T09:50:55.957Z",
      "bitcoin_block_height": 972122,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6ad5cbe0653fdddaa86683aa94a90ce76f3bd325b7b377c8685e995be70e20eaac52d4bc8ac8b49f5a803ada"
        },
        {
          "type": "bitcoin",
          "block_height": 972122,
          "merkle_root": "9febf6a47ce3de4f3431ea047a4b8031ebe40d777af2b89bd0f20f5f8bcfce3b"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-19T07:50:55.929Z",
      "updated_at": "2026-10-19T13:12:46.678Z",
      "bitcoin_block_height": 972141,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6ad5cbe008a5b203d76febc1209742d386febda805a4b444d068bb999ce13095df998c6aec3beceb67e255e4"
        },
        {
          "type": "bitcoin",
          "block_height": 972141,
          "merkle_root": "a2669dac9d1dcda64d589cf47a01dabda7b7795947ade803a80bf14225fd6550"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/12/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."
}