{
  "height": 101,
  "block_hash": "eb0b4ec015293f1b98ee0e7de9b23519b9802b95582889804453f9fbdd7d3202",
  "status": "confirmed",
  "bitcoin_block_height": 974888,
  "digest": {
    "alg": "sha256",
    "hex": "eb0b4ec015293f1b98ee0e7de9b23519b9802b95582889804453f9fbdd7d3202",
    "preimage": "block:{\"at\":\"2026-11-07T03:15:45.423Z\",\"entry_count\":1,\"first_seq\":211,\"height\":101,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":211,\"merkle_root\":\"b4ea06e06678da659d88504a54a75db360b0c436899880a883596c9e9f485442\",\"prev_hash\":\"94d5079cd2953aac1a91553c1f3a3c44ac1ff8534498c9bc07ad5d99dd7e8dc2\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T03:18:43.476Z",
      "updated_at": "2026-11-07T05:18:43.485Z",
      "bitcoin_block_height": 974888,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee989704e7f2826e0a2fe6bb2c090898e7f5e95f1a1fd0f628c4ba8663bccb436de0561994db42dd1b9ac3"
        },
        {
          "type": "bitcoin",
          "block_height": 974888,
          "merkle_root": "a373ea77dcacd26df989734c2bed34895920c60a915ed91eb73aa06c53238081"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T03:18:43.476Z",
      "updated_at": "2026-11-07T05:18:43.485Z",
      "bitcoin_block_height": 974888,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee98976df37c2c76ca8647535f31a8e6bde399351c3472f5e7991362c5b0ce5bde82946c698dcd662d1c9a"
        },
        {
          "type": "bitcoin",
          "block_height": 974888,
          "merkle_root": "a373ea77dcacd26df989734c2bed34895920c60a915ed91eb73aa06c53238081"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T03:18:43.476Z",
      "updated_at": "2026-11-07T03:18:43.476Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee9897b3175633cadc67cd7008be7485f8be750167d64dd2c6afaec020469c13e1684bc01a73517d94420e"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/101/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."
}