{
  "height": 70,
  "block_hash": "4b2960e5f02552ac5b72c8c5d2f9192be4b3f3809c42d5addc926c416bd499c5",
  "status": "confirmed",
  "bitcoin_block_height": 974880,
  "digest": {
    "alg": "sha256",
    "hex": "4b2960e5f02552ac5b72c8c5d2f9192be4b3f3809c42d5addc926c416bd499c5",
    "preimage": "block:{\"at\":\"2026-11-07T01:59:15.204Z\",\"entry_count\":2,\"first_seq\":163,\"height\":70,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":164,\"merkle_root\":\"ec6195f807b155c9e6c1a06bddab45d0b94917f894ba86982430df8f617c7a40\",\"prev_hash\":\"19d0d56f1fdff99999a0ba37638e77af2801b87a719b3c3c8d3172965e340333\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T02:08:43.462Z",
      "updated_at": "2026-11-07T04:08:43.478Z",
      "bitcoin_block_height": 974880,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee882c7394c6255a0beddbfd52afeecd9e71102f7af5e07e2ac407ce78d3d12c494b7902bc62b4296c0ab5"
        },
        {
          "type": "bitcoin",
          "block_height": 974880,
          "merkle_root": "e20917e92c25ba0bebbc60b5b7fe48f0ee84f05c3eb4987c3107d249f2c7113d"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T02:08:43.462Z",
      "updated_at": "2026-11-07T04:08:43.478Z",
      "bitcoin_block_height": 974883,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee882cc042c00d1d9efec7dfb255a019aa6fcf1d1ba980c50ecbe02b87c04d67dc34123b06e832d86a2699"
        },
        {
          "type": "bitcoin",
          "block_height": 974883,
          "merkle_root": "79abb9dd33baad0a1ff37045cc779f6fe1b133a7037999fbd2c996ad78e43b90"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T02:08:43.462Z",
      "updated_at": "2026-11-07T02:08:43.462Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee882c1b41cdbb57e4993e1795888d4787d28889bd200e72a4b01d59b708534ec7eeec8483d072ecdbf867"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/70/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."
}