{
  "height": 54,
  "block_hash": "ae3d574db35ca4e644efc05748842a1f80d69e4b470151431cd6f19d7fb3ca98",
  "status": "confirmed",
  "bitcoin_block_height": 972959,
  "digest": {
    "alg": "sha256",
    "hex": "ae3d574db35ca4e644efc05748842a1f80d69e4b470151431cd6f19d7fb3ca98",
    "preimage": "block:{\"at\":\"2026-10-24T18:01:02.028Z\",\"entry_count\":1,\"first_seq\":56,\"height\":54,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":56,\"merkle_root\":\"f99aad06effd17ed3c54d81c51ffd84ffefe9fd1c86481248b4e96830e5b3193\",\"prev_hash\":\"1d04c22f98a3011b7c622d500dcd20cf0ce09159357e5cdd7f6222d7b99ab1c1\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:10:31.663Z",
      "updated_at": "2026-10-24T19:13:06.800Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcf498ccd8352fe1e5d543d2b3ad4524f7f9fd5939224f0a572a91363f0b933455da63abf073a7cd0d7cb5"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:10:31.663Z",
      "updated_at": "2026-10-24T19:13:06.800Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcf49852fa3c828bf40638e0d9b57c89cc4d07b53849f6ebcc70c670da684235f7611ca5fa75a36cf679c3"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:10:31.663Z",
      "updated_at": "2026-10-24T19:13:06.800Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcf498947784c153bd642b56c7874a820b4294354acf056262830ead24c9e37b0fce0d2aa6a001af30e9bf"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/54/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."
}