{
  "height": 120,
  "block_hash": "f3755bdd7f5798bcc974a2426c6e1db0b3581e610ed02a7067826c3e235341a5",
  "status": "confirmed",
  "bitcoin_block_height": 972992,
  "digest": {
    "alg": "sha256",
    "hex": "f3755bdd7f5798bcc974a2426c6e1db0b3581e610ed02a7067826c3e235341a5",
    "preimage": "block:{\"at\":\"2026-10-24T23:38:38.085Z\",\"entry_count\":1,\"first_seq\":123,\"height\":120,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":123,\"merkle_root\":\"351f3f2458193a26273ccb028c708fa7026cbe97b9b4537de658d3be4e71c17d\",\"prev_hash\":\"8fc80f1ec3bb333e5658d6a4bc76b5616869136ab5c7da5af3a04534567e0b29\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T23:44:06.863Z",
      "updated_at": "2026-10-25T01:39:22.930Z",
      "bitcoin_block_height": 972992,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add42c83945c5d2daa6ccac589cbdbe6d808a3cacde0435c20bdf727784ea4610203df42b089db0f9f1bdf0"
        },
        {
          "type": "bitcoin",
          "block_height": 972992,
          "merkle_root": "433ee89ea1ad5aa815ed2884b3befa05c425284f1598fbab3892d6139cc2c7ac"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T23:44:06.863Z",
      "updated_at": "2026-10-25T01:39:22.930Z",
      "bitcoin_block_height": 972993,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add42c71ad99464367d4b44c26d2295173571e7c0aabe180b99c140db3e3dea16fe024b7635940214eec531"
        },
        {
          "type": "bitcoin",
          "block_height": 972993,
          "merkle_root": "38bdcfa6c75f0a225d7d4bec4e7744155441254baa8d040a293832c096def847"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T23:44:06.863Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add42c7fde1ef010ecabfab3c3b000da2dd38836939742090b47ac5ba42230f3ced1ee0ee0bbbe16f739622"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/120/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."
}