{
  "height": 68,
  "block_hash": "171ef9673ca5823951cd9e15f12600f7bd5392a0831ea640c9308da85be9b2c5",
  "status": "confirmed",
  "bitcoin_block_height": 972968,
  "digest": {
    "alg": "sha256",
    "hex": "171ef9673ca5823951cd9e15f12600f7bd5392a0831ea640c9308da85be9b2c5",
    "preimage": "block:{\"at\":\"2026-10-24T19:13:37.242Z\",\"entry_count\":1,\"first_seq\":70,\"height\":68,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":70,\"merkle_root\":\"41eea41b8049f1a15392e9bf1e4c051fba9c04bf32c20a8afc9a959474bdda2e\",\"prev_hash\":\"37426d46fb3bb3268317ef4cdc54bac59a492fd5d40ff3ced3bebd3908fb0229\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:23:06.803Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add059b98e93e869fee6c6d432cf2b864f5cae57d52c85846c0de5f5854e6ff2b0ab3df7e5f9ef32cf0fcde"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:23:06.803Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add059b26ff19fd309f3126349cacf491ba82ed2a0469695a329a41a239687895f8c8e56cf8d805d18e69c9"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:23:06.803Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add059bf0c2aa364850255b88edb46aa1e87e88ed3fb24e7731371c084425873b822310bf1097f98b1d3882"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/68/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."
}