{
  "height": 43,
  "block_hash": "8e86f0a03a95985ccfece3338601918a25d7ff136828eaac1b3f734b53cb7945",
  "status": "pending",
  "bitcoin_block_height": null,
  "digest": {
    "alg": "sha256",
    "hex": "8e86f0a03a95985ccfece3338601918a25d7ff136828eaac1b3f734b53cb7945",
    "preimage": "block:{\"at\":\"2026-11-07T00:54:14.930Z\",\"entry_count\":2,\"first_seq\":122,\"height\":43,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":123,\"merkle_root\":\"326629e897540782e60f5ccf74efc9da21a7cf2cc897eda4c5d6eaeda2f82b06\",\"prev_hash\":\"eb368a4b22bdf9cc3d5f98e6b8324505c401f3a9f5322adc4440c03d93e97f6e\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "pending",
      "submitted_at": "2026-11-07T00:58:43.456Z",
      "updated_at": "2026-11-07T00:58:43.456Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee77c6a3f9d5890ec0ed4873f36eadc12961f9e3e47e50fd5efd7f329e2c78d858c75c2ae7445de161901c"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "pending",
      "submitted_at": "2026-11-07T00:58:43.456Z",
      "updated_at": "2026-11-07T00:58:43.456Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee77c6b29f6243b289c28416f7b4b2ab9ff366db5c144488047bd0b6aed4439af0496501d0357dd4dde043"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T00:58:43.456Z",
      "updated_at": "2026-11-07T00:58:43.456Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee77c5f253b0a46db00d12dff127f65a2f37ab7a1955adf43fb544fd938dc54f0ec7555c0507507826d2e3"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/43/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."
}