{
  "height": 66,
  "block_hash": "16b4dc28a643490df80f1adb9d965c35fa6bfe52703e42445641836fd3b4ae59",
  "status": "confirmed",
  "bitcoin_block_height": 972968,
  "digest": {
    "alg": "sha256",
    "hex": "16b4dc28a643490df80f1adb9d965c35fa6bfe52703e42445641836fd3b4ae59",
    "preimage": "block:{\"at\":\"2026-10-24T19:03:37.188Z\",\"entry_count\":1,\"first_seq\":68,\"height\":66,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":68,\"merkle_root\":\"56aae58c6938f969b039ffc01dd355ed85bcc0e9cb4fe4eaeff477343a127bff\",\"prev_hash\":\"1a97990412a884ef2c892bc00b304df269ba2512e423f54589423b81417cee96\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:13:06.800Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add0343301ebdadd1ab4c80d22f84789f1a5bc97899a9754ea552091f316316323638d391776bd5ff01f86e"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:13:06.800Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add03433bff2ba61aabfad960f1254aff501576f0bd52fa30771905eb4f302f7853051f0252283e237a9b7d"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:13:06.800Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add03441b39428af0a14c6d13738d500ce680238da1818a0ecaca0320cc11d8b3719dbd0234a1a0b920aa5f"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/66/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."
}