{
  "height": 75,
  "block_hash": "8cb6496179641e5d87bbc10926e716b3924f48f62ff2bf51be9cd3ce2269f1f4",
  "status": "confirmed",
  "bitcoin_block_height": 972968,
  "digest": {
    "alg": "sha256",
    "hex": "8cb6496179641e5d87bbc10926e716b3924f48f62ff2bf51be9cd3ce2269f1f4",
    "preimage": "block:{\"at\":\"2026-10-24T19:48:37.576Z\",\"entry_count\":1,\"first_seq\":77,\"height\":75,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":77,\"merkle_root\":\"00f876ca7552640f5931049bc4eae5d5ec548b20ab227a0614ceb0c54cd4b27d\",\"prev_hash\":\"fe8aca317d3933d59d55a2707a532ba2b06b86c58697416934c5b7a994a9a537\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:53:06.806Z",
      "updated_at": "2026-10-24T20:56:48.978Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add0ca55a3f52bcf8168791eef128729d188a8ac4b02a60eb50532130554b86817db9acdd2f75dfe301d444"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:53:06.806Z",
      "updated_at": "2026-10-24T20:56:48.978Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add0ca46a042ad4fb604d414167fc32199a3e6f6058b04ea579b57c367fdf11827c6632a0715b226dee2d28"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:53:06.806Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add0ca4c2e7f4e964b713f4e140e5877e23d25cd0451641bcdf751bd44a9e4eac1ca2fad5ff9d5f7e64acc9"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/75/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."
}