{
  "height": 55,
  "block_hash": "ff01b74e3834a7ff706bee409829ce6338233cd9c8b2b13071ce265401e7c115",
  "status": "confirmed",
  "bitcoin_block_height": 972959,
  "digest": {
    "alg": "sha256",
    "hex": "ff01b74e3834a7ff706bee409829ce6338233cd9c8b2b13071ce265401e7c115",
    "preimage": "block:{\"at\":\"2026-10-24T18:06:02.079Z\",\"entry_count\":1,\"first_seq\":57,\"height\":55,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":57,\"merkle_root\":\"44ef882828adb565e909b74fa150124e309ee501bf1e0df04e4573e6f018b0fd\",\"prev_hash\":\"ae3d574db35ca4e644efc05748842a1f80d69e4b470151431cd6f19d7fb3ca98\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:10:31.663Z",
      "updated_at": "2026-10-24T19:13:06.800Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcf4991d64859423634e5189c8342eb508977ccc103b3d05f537cd1710fb47062435e399ea4e1302f4f688"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:10:31.663Z",
      "updated_at": "2026-10-24T19:13:06.800Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcf499cf3bafbbbccb4f6f756674d355bd256c14a2dc7f488db637a3443770c9d6b97b87e1bed761d74a75"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:10:31.663Z",
      "updated_at": "2026-10-24T19:13:06.800Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcf499c88d32524ff966e2f1bfc3e03faa5f1d17c5882f5c7070f003dd7c027f5a3fe44ee08c10691fc1a8"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/55/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."
}