{
  "height": 28,
  "block_hash": "9fb7ea6e0b4d57fcd331f789c285b61157ee4cd4a90a085fcd30e89c54dc484b",
  "status": "confirmed",
  "bitcoin_block_height": 972955,
  "digest": {
    "alg": "sha256",
    "hex": "9fb7ea6e0b4d57fcd331f789c285b61157ee4cd4a90a085fcd30e89c54dc484b",
    "preimage": "block:{\"at\":\"2026-10-24T15:43:44.802Z\",\"entry_count\":1,\"first_seq\":30,\"height\":28,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":30,\"merkle_root\":\"67f90215a6dd4a9281b70953a5b0895e9684ee9d48ab44cee209340fb4947f43\",\"prev_hash\":\"8dfddc4c48fcd8d085b0918fb2795f731aa43f821e94ce9081f3141ee0534759\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T15:53:14.707Z",
      "updated_at": "2026-10-24T18:43:36.793Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcd46b9b9d6866e05d7391d468f4be80656d3b16cf0ac98e2e4aea3df52dbe75472daef171fed62a4fb45b"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T15:53:14.707Z",
      "updated_at": "2026-10-24T18:43:36.793Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcd46b16056fe6f8b2c66da508fcec5c6e9c7dd2fa34054c2d52fec8549e36d1857286676c3c5a0cf0ffd6"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T15:53:14.707Z",
      "updated_at": "2026-10-24T19:53:06.806Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcd46bf52f02bfe28e282c731267a4c19f62546a1ce09505c60faf4cda7f46b2292b4266138bc7e15c89ca"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/28/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."
}