{
  "height": 29,
  "block_hash": "fe6320ef4c7d846b08b9263c0946dd11d6cda306406c291511204b80f74d1615",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "fe6320ef4c7d846b08b9263c0946dd11d6cda306406c291511204b80f74d1615",
    "preimage": "block:{\"at\":\"2026-11-07T00:14:13.545Z\",\"entry_count\":2,\"first_seq\":99,\"height\":29,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":100,\"merkle_root\":\"43250f2ca356309c4d16db0371889f496f10926a227c083f4a4aad5bc31d346e\",\"prev_hash\":\"74fda32609f3d186ca8ef8f8a8f27828e130de238152a43db40cd95cf3c99973\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T00:18:43.452Z",
      "updated_at": "2026-11-07T03:18:43.476Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee6e66b06fa430b8651b9ce217d40cd69b56b08a6452e73e056a4126368012fa3212dbc8ab7bf290a42c85"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T00:18:43.452Z",
      "updated_at": "2026-11-07T03:18:43.476Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee6e66de57ca887b631e694e784a220cfe94a6cbaa522b7166c2cbd4d95e965eb5ab5e6ddcb0b13f3f200b"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-07T00:18:43.452Z",
      "updated_at": "2026-11-07T03:18:43.476Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee6e66458583bb78e24be09ccca6ce1ca226de519e67a59af0eda8256290fd0dc9e1fd203f83c190c1cff5"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/29/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."
}