{
  "height": 30,
  "block_hash": "648f79627f0ee917d830f92ea5e7be00135569447d900506b6f70f6842dc8cd0",
  "status": "confirmed",
  "bitcoin_block_height": 972955,
  "digest": {
    "alg": "sha256",
    "hex": "648f79627f0ee917d830f92ea5e7be00135569447d900506b6f70f6842dc8cd0",
    "preimage": "block:{\"at\":\"2026-10-24T15:53:44.867Z\",\"entry_count\":1,\"first_seq\":32,\"height\":30,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":32,\"merkle_root\":\"a93ef62b74f70d8cda5693aff11ec349248edf9b0ffc8a7170992c14eb65f2db\",\"prev_hash\":\"2c523fcf215360c396ec28b1019812a2eb55dceb1c9106926bb38c999239238f\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:03:14.735Z",
      "updated_at": "2026-10-24T18:43:36.793Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcd6c30c7b0ac307f40bc5a11bb635b5b6edff64afbca556038f7612718a1a669639da84c5ca7e6ea58841"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:03:14.735Z",
      "updated_at": "2026-10-24T18:43:36.793Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcd6c333d34be3876d588550f3ffa0ce1205d59eed4abf5914006ffc682dffdabf948b1abc7645afc17aa4"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:03:14.735Z",
      "updated_at": "2026-10-24T19:53:06.806Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcd6c3da85e8563a1379adf01a4a18e1fa36c5833b5a42ca91fa166e0ee9010e0463e3dc1ad607026f3074"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/30/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."
}