{
  "height": 47,
  "block_hash": "ed602ab400c4eafac9da097cb1ff533a98fa3f4c89c102d28d4e26f42c879c01",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "ed602ab400c4eafac9da097cb1ff533a98fa3f4c89c102d28d4e26f42c879c01",
    "preimage": "block:{\"at\":\"2026-11-07T01:04:14.988Z\",\"entry_count\":2,\"first_seq\":128,\"height\":47,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":129,\"merkle_root\":\"48fd054ae7e73710b0c80c736a4d017a36de3d3041d46f9358d14d99c64f53b6\",\"prev_hash\":\"b9bbca5a5553ab73a603467ee4fa2866c41c06d80d245a82b79f99ebc1d28993\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:08:43.458Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee7a1ea9bfa33d351ad10aceafa7c8cf6654956647155342026e649aebba187215dda1810d6288a7665e17"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:08:43.458Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee7a1e962e49700b6789841faabf168e0fa54a1dd68b2949cbac575362c5a27b1bb4f2eeebac15ccf3b6ec"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:08:43.458Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee7a1eb89d3c4d1ee3c713dc1f4910dcbfdc7e4f84c4bf6c0e407b89af0cdd85004512ff7a292561a1375b"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/47/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."
}