{
  "height": 69,
  "block_hash": "19d0d56f1fdff99999a0ba37638e77af2801b87a719b3c3c8d3172965e340333",
  "status": "confirmed",
  "bitcoin_block_height": 974880,
  "digest": {
    "alg": "sha256",
    "hex": "19d0d56f1fdff99999a0ba37638e77af2801b87a719b3c3c8d3172965e340333",
    "preimage": "block:{\"at\":\"2026-11-07T01:57:15.197Z\",\"entry_count\":1,\"first_seq\":162,\"height\":69,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":162,\"merkle_root\":\"22dd65cf8279757557e2c762a6a2ee0ec8cb52fe68fb5fa489282175de277924\",\"prev_hash\":\"c4c3c19b59c154726f3b092defc0da327b32a59a1d21f8cdea8fcb556b69628f\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:58:43.462Z",
      "updated_at": "2026-11-07T03:58:43.477Z",
      "bitcoin_block_height": 974880,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee85d64f7bc9833ed6e31755d3ce62940039fd722818d9f2b2459f0ccc7e31b3921dd9c2f63722aa8859de"
        },
        {
          "type": "bitcoin",
          "block_height": 974880,
          "merkle_root": "e20917e92c25ba0bebbc60b5b7fe48f0ee84f05c3eb4987c3107d249f2c7113d"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:58:43.462Z",
      "updated_at": "2026-11-07T04:58:43.484Z",
      "bitcoin_block_height": 974883,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee85d702d188e0d9f7995016f2702eb9e82ca8a80e659e290465e02ccf4c885788b1e2b77581a7eb3cb185"
        },
        {
          "type": "bitcoin",
          "block_height": 974883,
          "merkle_root": "79abb9dd33baad0a1ff37045cc779f6fe1b133a7037999fbd2c996ad78e43b90"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T01:58:43.462Z",
      "updated_at": "2026-11-07T01:58:43.462Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee85d73c5990fff12d1e8dbed4d6a27dea7da3349ceabf88b8920f8c898213b0043184c21d517cc36407f3"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/69/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."
}