{
  "height": 38,
  "block_hash": "57fe466b2ca71f303e4734d87067a229e4d70b519306a190c19a8a973666a8dc",
  "status": "confirmed",
  "bitcoin_block_height": 972955,
  "digest": {
    "alg": "sha256",
    "hex": "57fe466b2ca71f303e4734d87067a229e4d70b519306a190c19a8a973666a8dc",
    "preimage": "block:{\"at\":\"2026-10-24T16:36:48.167Z\",\"entry_count\":1,\"first_seq\":40,\"height\":38,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":40,\"merkle_root\":\"c8d5ae59cb1f77c758a5b0d315f0208df47ca8b8616d5e06bf6f7b1eb519cc98\",\"prev_hash\":\"bab99bc29377c1a44e58146832dba28e2a67e248bf6e777a83d3eb0aaf756aa6\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:56:17.962Z",
      "updated_at": "2026-10-24T18:43:36.793Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adce332784438ee54562db51b4271623b546c9ef89572030552a3d5e7bec37dbf9fb6194590803abb5e1b3f"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:46:17.960Z",
      "updated_at": "2026-10-24T18:43:36.793Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adce0daee616041c19b4552d5119b7e25d2bcdbcbffe1ee82c21439d37b7dc361cddd9e8cb0f46db1f14b0e"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:46:17.960Z",
      "updated_at": "2026-10-24T19:53:06.806Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adce0dbd909b071acc6922078092929815c5c73b2e39d683cbccc67fa3ae818ac5aabcc6d278d9fe08c1134"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/38/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."
}