{
  "height": 39,
  "block_hash": "0f5e84630e9a7aa1d1a4b6b39dba6ee5d5a0dfe1a7c2237770db5c779a3d7eaf",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "0f5e84630e9a7aa1d1a4b6b39dba6ee5d5a0dfe1a7c2237770db5c779a3d7eaf",
    "preimage": "block:{\"at\":\"2026-11-07T00:46:44.892Z\",\"entry_count\":1,\"first_seq\":117,\"height\":39,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":117,\"merkle_root\":\"5d157c003fccaa45a222f036a065466db172ec0b433cce177aaa8155fdb15609\",\"prev_hash\":\"c3d096f89400369f3ad672c2e85e92c6881ea12233473401a2e59298ad138de9\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T00:48:43.456Z",
      "updated_at": "2026-11-07T02:48:43.467Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee756fa5769ba89141d2e42eb7091fe9b8538382e24647eed0965f3ee296281486af35952d81ca0aef4881"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T00:48:43.456Z",
      "updated_at": "2026-11-07T03:48:43.477Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee756f98420d1b8085c5e9adc84ac8ee721cfed3b397340889391517f319b7892d974c51c5ea42472c0694"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-07T00:48:43.456Z",
      "updated_at": "2026-11-07T03:48:43.477Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee756f80bf69dedeb9fae6a930a6c5e641639ca4c411e649c18eb2fcb43299d3dbda6665262dc34084b4a3"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/39/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."
}