{
  "height": 158,
  "block_hash": "58861623133395651fd3cbbdad1ddb86d618a387e56c95df0fc68e5a9efe5923",
  "status": "confirmed",
  "bitcoin_block_height": 973009,
  "digest": {
    "alg": "sha256",
    "hex": "58861623133395651fd3cbbdad1ddb86d618a387e56c95df0fc68e5a9efe5923",
    "preimage": "block:{\"at\":\"2026-10-25T02:50:02.549Z\",\"entry_count\":2,\"first_seq\":188,\"height\":158,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":189,\"merkle_root\":\"16999eda1ed690787a43f495ee10c6673ead7af9ffcb6fe4cb84cf22a056990c\",\"prev_hash\":\"fd680805e16ef02f6234d0930866ba3f0c74ac31ce948f5f0776fe8e0cb9232e\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:59:17.526Z",
      "updated_at": "2026-10-25T04:08:50.519Z",
      "bitcoin_block_height": 973009,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add708685a3af3de6c7055ee117ddb26abc7bdb38a153e00711e31134b90da939174785244d3ae020e92969"
        },
        {
          "type": "bitcoin",
          "block_height": 973009,
          "merkle_root": "141cf56f7b4558df3d03647f005a747090c85f503425d28edb46d7b28e45ce37"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:59:17.526Z",
      "updated_at": "2026-10-25T04:08:50.519Z",
      "bitcoin_block_height": 973009,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add7086a3ca88b59907755d71172fb5cdc01f64da960f2708730790aaf96dd74e144a97c86ec2d6bdf47e09"
        },
        {
          "type": "bitcoin",
          "block_height": 973009,
          "merkle_root": "141cf56f7b4558df3d03647f005a747090c85f503425d28edb46d7b28e45ce37"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T02:59:17.526Z",
      "updated_at": "2026-10-25T02:59:17.526Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add7086103abe0a484c1c086d6a4f9eee28a69e00650c5f87c9ced6f496a1f2ccec1e8ea80097a791cae3e7"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/158/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."
}