{
  "height": 152,
  "block_hash": "b30c16bcbb19f3a4c56dd5604d3577ea4d4921067a1a3cc256c3cde05fe6c97a",
  "status": "confirmed",
  "bitcoin_block_height": 973005,
  "digest": {
    "alg": "sha256",
    "hex": "b30c16bcbb19f3a4c56dd5604d3577ea4d4921067a1a3cc256c3cde05fe6c97a",
    "preimage": "block:{\"at\":\"2026-10-25T02:19:23.610Z\",\"entry_count\":2,\"first_seq\":175,\"height\":152,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":176,\"merkle_root\":\"9f13e1fa17824fc8b9a8f551d1b9122de22c2916b80b51673e435dfe2d064641\",\"prev_hash\":\"a8a129ebcb2b4a76532aa07b562c2456cdd8aca6a1ed3698305e43bf9a351e79\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:28:52.921Z",
      "updated_at": "2026-10-25T04:38:50.522Z",
      "bitcoin_block_height": 973005,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add69667b2dc9ef95c85365318ca690962b23d7a76051b88aa6309c8b91d4135d993f12f26ea1aad2c361a9"
        },
        {
          "type": "bitcoin",
          "block_height": 973005,
          "merkle_root": "cc85efef5df8fdca5c847d30ae06884a21a18bddeb1fc8c0fe7e92c7fab5b740"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:28:52.921Z",
      "updated_at": "2026-10-25T04:38:50.522Z",
      "bitcoin_block_height": 973005,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add69657259285eeb87d9eef99ae97e87fe972b845d20e1c9fb5bf9c17379b3d47cc665cf48aae082b3e1e7"
        },
        {
          "type": "bitcoin",
          "block_height": 973005,
          "merkle_root": "cc85efef5df8fdca5c847d30ae06884a21a18bddeb1fc8c0fe7e92c7fab5b740"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T02:28:52.921Z",
      "updated_at": "2026-10-25T02:28:52.921Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add696559a5ad1dc95fc6a633c9b718daf12b1a13371062226315f4cafca6194d9a2d2c2464d6ee59a14020"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/152/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."
}