{
  "height": 41,
  "block_hash": "cd1a4fa67c77323ff876d68079b66c98684b677c1cefd776618d4bfca9c674e5",
  "status": "confirmed",
  "bitcoin_block_height": 972955,
  "digest": {
    "alg": "sha256",
    "hex": "cd1a4fa67c77323ff876d68079b66c98684b677c1cefd776618d4bfca9c674e5",
    "preimage": "block:{\"at\":\"2026-10-24T16:51:48.236Z\",\"entry_count\":1,\"first_seq\":43,\"height\":41,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":43,\"merkle_root\":\"09c2e07a9d2b9ed5f618684d1611f914bbe23485924bfad63d2787a9066de12b\",\"prev_hash\":\"af863bd8b4d2e5dbdc11197faed3cdf6ae8054aaa847dc03ed8b1bfcc0845cd6\",\"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": "6adce33570310bd1e2b0f2ce23363177a91ffeb7a810cb821861d008eeb9c334393fe6209b42e5ae71b48501"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://b.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://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adce333023c2e10840404b6aee3e91d2989160e1aed88b74627450b50bbd218be1cbce1b4d80b61f9c547db"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T16:56:17.962Z",
      "updated_at": "2026-10-24T19:53:06.806Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adce333d398d6fa73b8ee68ab72f3b9c4a27e221e16654ab88f490c8027ec73a9a33f9663100435119118c4"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/41/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."
}