{
  "height": 102,
  "block_hash": "d2d1c3ade70611e3d1064bc4fe425d803d6571633d137bcb1cf87a508f6e2832",
  "status": "confirmed",
  "bitcoin_block_height": 974888,
  "digest": {
    "alg": "sha256",
    "hex": "d2d1c3ade70611e3d1064bc4fe425d803d6571633d137bcb1cf87a508f6e2832",
    "preimage": "block:{\"at\":\"2026-11-07T03:18:30.427Z\",\"entry_count\":1,\"first_seq\":212,\"height\":102,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":212,\"merkle_root\":\"079224dec4f3d49186318bf7d3f081398d6b6529df33600512c55877ae2eb234\",\"prev_hash\":\"eb0b4ec015293f1b98ee0e7de9b23519b9802b95582889804453f9fbdd7d3202\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T03:18:43.476Z",
      "updated_at": "2026-11-07T05:18:43.485Z",
      "bitcoin_block_height": 974888,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee989813f669d7fa26dfe1cc5a7a7666d548593b59436e773a60e01724755e7dbe0f023d397b858377990a"
        },
        {
          "type": "bitcoin",
          "block_height": 974888,
          "merkle_root": "a373ea77dcacd26df989734c2bed34895920c60a915ed91eb73aa06c53238081"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T03:18:43.476Z",
      "updated_at": "2026-11-07T05:18:43.485Z",
      "bitcoin_block_height": 974888,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee9898f4c4f7f74c62bafb08e15789d5121d708bb5ce764ee2ae1ee6b8678f649678410b867505a71fc27c"
        },
        {
          "type": "bitcoin",
          "block_height": 974888,
          "merkle_root": "a373ea77dcacd26df989734c2bed34895920c60a915ed91eb73aa06c53238081"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T03:18:43.476Z",
      "updated_at": "2026-11-07T03:18:43.476Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee9898c6e427ae36a5fe37da9c417f488ec2489952abadaf2b9eeeff9ecc6d8f285ccbeae9e0c68e3c7300"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/102/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."
}