{
  "height": 100,
  "block_hash": "1131bc0c970ea2189fefa6384ac64838d5ce250c04887aa874ed9bb05d0ca698",
  "status": "confirmed",
  "bitcoin_block_height": 972982,
  "digest": {
    "alg": "sha256",
    "hex": "1131bc0c970ea2189fefa6384ac64838d5ce250c04887aa874ed9bb05d0ca698",
    "preimage": "block:{\"at\":\"2026-10-24T21:52:52.551Z\",\"entry_count\":1,\"first_seq\":103,\"height\":100,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":103,\"merkle_root\":\"35dd68b6f19fe8af7c72880b4ddb002517f83e0d9e6f95676eb1e346ff87f217\",\"prev_hash\":\"cce16312b985bcac8919eac1f24cb90586a722fbd56183745e4528f4e69c4231\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T21:57:22.443Z",
      "updated_at": "2026-10-24T23:44:06.863Z",
      "bitcoin_block_height": 972982,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add29c43605dc7b3c3e190d7d7c9ec55b9a8048a2c83c44c87111e46ba662789525b4ece028f70351f28d84"
        },
        {
          "type": "bitcoin",
          "block_height": 972982,
          "merkle_root": "4c99dddccb05ff6394193624edeedc186bccaa073a9bcae6d83f1f485bcee966"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T21:57:22.443Z",
      "updated_at": "2026-10-24T23:44:06.863Z",
      "bitcoin_block_height": 972982,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add29c46262c8878a3f6a39c869df50b1531453a6f181e891b5d85231d1ab67dcf1924454cf5a7720ecd240"
        },
        {
          "type": "bitcoin",
          "block_height": 972982,
          "merkle_root": "4c99dddccb05ff6394193624edeedc186bccaa073a9bcae6d83f1f485bcee966"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T21:57:22.443Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add29c3ef87a6113b152881edc67e6eb62f5c5f90956c2f9be2a6dc75d7b06814d5d28c36416fb725d766df"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/100/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."
}