{
  "height": 99,
  "block_hash": "01e36dc3e6addc381f08ef4b76591910e805cd99064c1dafcb60818a129e597c",
  "status": "confirmed",
  "bitcoin_block_height": 974888,
  "digest": {
    "alg": "sha256",
    "hex": "01e36dc3e6addc381f08ef4b76591910e805cd99064c1dafcb60818a129e597c",
    "preimage": "block:{\"at\":\"2026-11-07T03:10:45.411Z\",\"entry_count\":1,\"first_seq\":208,\"height\":99,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":208,\"merkle_root\":\"4a90343126879df83534d7271c72f9da57acd517ccec8870ca82b3656841fb66\",\"prev_hash\":\"f0dd016735065ef2bc44e74e69034b85451e6f8c86dbadf8e2b5fdf778c2a81d\",\"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": "6aee98954ebc3be30195538c276c8ff6392ae313c73814a83a4b15d12114f0df63c298cdd55cc340566cce22"
        },
        {
          "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": "6aee9895e28f0c22fe7c4c9323084968e9b7535012afb03f65ee9ebba727e36373cfa9a3a0851b403f9bfa06"
        },
        {
          "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": "6aee989544df08735a7d0c90be22e43f3b3d9ae3ee6d1af8bf38ac7f1364739c8d8a0e56ff8ee5bb8c9d23d3"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/99/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."
}