{
  "height": 71,
  "block_hash": "185410da5418bada627003dcb4515e03c329b7491ed2ac4d03606f05ee0a2f1f",
  "status": "confirmed",
  "bitcoin_block_height": 972968,
  "digest": {
    "alg": "sha256",
    "hex": "185410da5418bada627003dcb4515e03c329b7491ed2ac4d03606f05ee0a2f1f",
    "preimage": "block:{\"at\":\"2026-10-24T19:28:37.492Z\",\"entry_count\":1,\"first_seq\":73,\"height\":71,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":73,\"merkle_root\":\"a0c58db961d8dd4a96b660db66f75c89af5ad5f87afaf962e1ddae7831635e45\",\"prev_hash\":\"0f8d6b23872cd7878b755cca881c65bfd2bbd90d8347f203407495078322fec8\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:33:06.804Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add07f41c7acf84b780a8119010cbc6d8be7fa3516c4063454ed4dcd3aebb0eb4e8f421c1cc5ed150bdaafe"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:33:06.804Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add07f45f9e9c6c5d37a6594272eb8b5a821ebbe47970cd3b957f68fb296c63d40f1979aece5a7367c08357"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:33:06.804Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add07f4b56758ee40f143c3aee1a2fd36bfa2d193b7614d8431eae0150d049f5e1b9228daaec28bf79d09ac"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/71/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."
}