{
  "height": 40,
  "block_hash": "af863bd8b4d2e5dbdc11197faed3cdf6ae8054aaa847dc03ed8b1bfcc0845cd6",
  "status": "confirmed",
  "bitcoin_block_height": 972955,
  "digest": {
    "alg": "sha256",
    "hex": "af863bd8b4d2e5dbdc11197faed3cdf6ae8054aaa847dc03ed8b1bfcc0845cd6",
    "preimage": "block:{\"at\":\"2026-10-24T16:46:48.215Z\",\"entry_count\":1,\"first_seq\":42,\"height\":40,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":42,\"merkle_root\":\"dc6ecc87c880f6f4968c3e5d3f9c9af2ee1a9dd9423926b82c9723cc2e8b5d46\",\"prev_hash\":\"9269f3edc17607a4b49b3a433a5c6a5ca0f1c8b4215e2137f93e3c8729304a99\",\"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": "6adce334188c2ec958fcd9974a7410d5fdc2fcf2bc4ce4bfbbe162796848e1483bdb75ec5d03a84d11ebd5c6"
        },
        {
          "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": "6adce332ca7e2abcfbf2ac73ea8299677567735b06f167679c8e8cb57518d251bd4499e730962507513742e0"
        },
        {
          "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": "6adce3323704b1522218c2eae8748af8cc9927262cc1ba77ef662cce535b9c9151531c318ba56559c1864051"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/40/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."
}