{
  "height": 128,
  "block_hash": "e8dd2e00853a2cbb6762e07d445dc4d8dff82c3b75ab8b46d29076c4c5317ef1",
  "status": "confirmed",
  "bitcoin_block_height": 972999,
  "digest": {
    "alg": "sha256",
    "hex": "e8dd2e00853a2cbb6762e07d445dc4d8dff82c3b75ab8b46d29076c4c5317ef1",
    "preimage": "block:{\"at\":\"2026-10-25T00:14:07.123Z\",\"entry_count\":1,\"first_seq\":131,\"height\":128,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":131,\"merkle_root\":\"9af5041b50618a5f93e00ab60b214d4699110a509b4587da710ae27cf08b188e\",\"prev_hash\":\"b1beddb370e5bf8f820fbe69196b49e25da1bbec37ce05f6ebb5fedeb9f1448a\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T00:23:36.876Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add4c097b46d7e0b6713e331fc41966e2ef426a955c5c318598bfde2e2a98041aead7046603cd2a0f705748"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T00:23:36.876Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add4c0b5081bbb920b477d48b38999db8456fd01ada337015d113d921674e3f6d1a38e3eab76434f89f3046"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-25T00:23:36.876Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add4c0ab18c929bfd3745622348d133d326578ba84d3ec5c3215d2355b7df55172b57972c4040d5597395f0"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/128/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."
}