{
  "height": 44,
  "block_hash": "985eb038f9cb32a9dee163097240858b703e1c9ab5793439d3b9cb5a3bf69e16",
  "status": "confirmed",
  "bitcoin_block_height": 974874,
  "digest": {
    "alg": "sha256",
    "hex": "985eb038f9cb32a9dee163097240858b703e1c9ab5793439d3b9cb5a3bf69e16",
    "preimage": "block:{\"at\":\"2026-11-07T00:56:59.948Z\",\"entry_count\":1,\"first_seq\":124,\"height\":44,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":124,\"merkle_root\":\"6bc7a29212214a0cfd365675dc73da974fd4076fdf053758450cb4d619a3c79f\",\"prev_hash\":\"8e86f0a03a95985ccfece3338601918a25d7ff136828eaac1b3f734b53cb7945\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T00:58:43.456Z",
      "updated_at": "2026-11-07T02:58:43.471Z",
      "bitcoin_block_height": 974874,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee77c72577cf1983c19c04bccf06639ab6ed405be0cfffa9c2746d894df8786c85083ffd3d3615ed4f0a00"
        },
        {
          "type": "bitcoin",
          "block_height": 974874,
          "merkle_root": "fa522f272a37cb03554d5be30f11a1564362627a0d248c198befb5a303c3a302"
        }
      ]
    },
    {
      "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": "6aee77c705b54453dbcf3febde555912c06fd7d81f1508b4c1d2c89de2be438bfd917cad1bb7f4841c693821"
        }
      ]
    },
    {
      "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": "6aee77c685ac792eeb16324a610aa6e8ae390dfa2955c94f8237e12a95c6e0f3a2f7f01557e6a1c40e81bc44"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/44/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."
}