{
  "height": 38,
  "block_hash": "c3d096f89400369f3ad672c2e85e92c6881ea12233473401a2e59298ad138de9",
  "status": "pending",
  "bitcoin_block_height": null,
  "digest": {
    "alg": "sha256",
    "hex": "c3d096f89400369f3ad672c2e85e92c6881ea12233473401a2e59298ad138de9",
    "preimage": "block:{\"at\":\"2026-11-07T00:44:14.376Z\",\"entry_count\":2,\"first_seq\":115,\"height\":38,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":116,\"merkle_root\":\"65ffd2947dd191babeeb96ea6a8eb4759ccc5f5940a168563c5348ebd767dc18\",\"prev_hash\":\"a494994c67d1df4b5867a84e92729587611b3add380cef74ecca7d35414fe2d4\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "pending",
      "submitted_at": "2026-11-07T00:48:43.456Z",
      "updated_at": "2026-11-07T00:48:43.456Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee756e58a5d5cac580d521882db18c9160942cbda7c11da996ce655c2f666837c92217edea67d22c4fb725"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "pending",
      "submitted_at": "2026-11-07T00:48:43.456Z",
      "updated_at": "2026-11-07T00:48:43.456Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee756ef3d8ae3289f198a1321c9d490518c9050f0643b24a831f8cd3162b95e0deff2ecbf365c43236e681"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T00:48:43.456Z",
      "updated_at": "2026-11-07T00:48:43.456Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee756e6ee2e27d942b532cc711d0ae7ef7d9096f48e6a2fcef688bda2b35f25e7d10059c0423a7c5ef999f"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/38/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."
}