{
  "height": 2,
  "block_hash": "3ad76874df50da96bf7bb65c9b51093022c034c893118acdeea14389803ca69b",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "3ad76874df50da96bf7bb65c9b51093022c034c893118acdeea14389803ca69b",
    "preimage": "block:{\"at\":\"2026-11-06T22:15:33.431Z\",\"entry_count\":3,\"first_seq\":46,\"height\":2,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":48,\"merkle_root\":\"8c65c6dcb3f9615a4a867aa250fbab23983340c13f3ba6e832b9af7d1ff61eb2\",\"prev_hash\":\"6f4e1751e75bebf58a757bda61b5d8ff16494ca039a753b47ece4e024eae74de\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:24:47.903Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee53b02cfcabacfec48e01eb193709b73e8f59016a4589391fee18402ab64a4aeab7300d71f13e5617caba"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:24:47.903Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee53b182d090f2ac50017d78d358012eab6be103cbadc912ad4fdb1a469980550fa481bba5624386234cda"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-06T22:24:47.903Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee53b1901cd506210086321e6769bcd46e9917504711b6644aa6fea1949fcc2c0c874991c3553884271486"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/2/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."
}