{
  "height": 29,
  "block_hash": "2c523fcf215360c396ec28b1019812a2eb55dceb1c9106926bb38c999239238f",
  "status": "confirmed",
  "bitcoin_block_height": 972955,
  "digest": {
    "alg": "sha256",
    "hex": "2c523fcf215360c396ec28b1019812a2eb55dceb1c9106926bb38c999239238f",
    "preimage": "block:{\"at\":\"2026-10-24T15:48:44.834Z\",\"entry_count\":1,\"first_seq\":31,\"height\":29,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":31,\"merkle_root\":\"d42403f2b3dbae404863de738f9db784c22474dfd07e939d883cb31c671cba9d\",\"prev_hash\":\"9fb7ea6e0b4d57fcd331f789c285b61157ee4cd4a90a085fcd30e89c54dc484b\",\"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": "6adcd46cf637ad746f919d0855ca5e48c0d87c6a1ff9b3fbfbd757e9ec647a172abafa62219052602e4647ee"
        },
        {
          "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": "6adcd46c4dd90602d15bbc9bef79fd27ac414dd22143153853389ee7c93829bfcb2ee18186061a190db699b8"
        },
        {
          "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": "6adcd46ceaf55147be7f58de2a1f1e665bef2a96b3db038e244a4b3bd687200d69a1d69c3bc80ab6f7e3089b"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/29/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."
}