{
  "height": 24,
  "block_hash": "6af17e9c0b5c3be39d1d55ddf22f4cfd980724be121c55e12d2f444dac0a7cf6",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "6af17e9c0b5c3be39d1d55ddf22f4cfd980724be121c55e12d2f444dac0a7cf6",
    "preimage": "block:{\"at\":\"2026-11-06T23:58:43.445Z\",\"entry_count\":1,\"first_seq\":92,\"height\":24,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":92,\"merkle_root\":\"6a391ac44827fb80e5b3d967fce3e65b9c6049c715e186b06b6d6958ecc3eb64\",\"prev_hash\":\"9985ca14c7251a47d73cf2cd7276c30621bd5e915053e232ed7c482fe230b7e2\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T23:59:13.453Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee69d4ce500a1c17e0f5a4b137d2a548bdd38428543388e62621241f7167af0ba2955835ba7dc76af5c048"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-06T23:59:13.453Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee69d4b1f3e621e37f39e6bf25e1ebcc6e193c61bc525d5dd7aee41ec301d7344e7f2271638f7baf487ead"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-06T23:59:13.453Z",
      "updated_at": "2026-11-07T03:08:43.475Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee69d499af3372dba375e766501eb03dc01045e2d2e52bbbc101aa5d0ffdc4af4c0d798f4cb081a11c33f4"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/24/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."
}