{
  "height": 27,
  "block_hash": "8dfddc4c48fcd8d085b0918fb2795f731aa43f821e94ce9081f3141ee0534759",
  "status": "confirmed",
  "bitcoin_block_height": 972944,
  "digest": {
    "alg": "sha256",
    "hex": "8dfddc4c48fcd8d085b0918fb2795f731aa43f821e94ce9081f3141ee0534759",
    "preimage": "block:{\"at\":\"2026-10-24T15:38:44.776Z\",\"entry_count\":1,\"first_seq\":29,\"height\":27,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":29,\"merkle_root\":\"4590bd8edc47785835c7cc00c948fbeae24572101e02c6403aed7ea36619fdb9\",\"prev_hash\":\"f6c324eaf543423e848ede20d0f08bab268832280edf10972c04b2afddc850f9\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T15:43:14.706Z",
      "updated_at": "2026-10-24T16:56:17.962Z",
      "bitcoin_block_height": 972944,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcd213bbfa39127bf3aa62df97787daeceaf9b9cd8aa2c658d1520daad3668d8d529e7d98473c54cffff45"
        },
        {
          "type": "bitcoin",
          "block_height": 972944,
          "merkle_root": "7cef4b3063deecf55c9f86b448194f888a3723e26d1e7aaa1ef6b349573d4656"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T15:43:14.706Z",
      "updated_at": "2026-10-24T16:46:17.960Z",
      "bitcoin_block_height": 972944,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcd213ed372254911991f7bd1611b855bdb14daf4c1b9b7d087d11462a081f251024455e70958d2bb7fc0b"
        },
        {
          "type": "bitcoin",
          "block_height": 972944,
          "merkle_root": "7cef4b3063deecf55c9f86b448194f888a3723e26d1e7aaa1ef6b349573d4656"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T15:43:14.706Z",
      "updated_at": "2026-10-24T19:53:06.806Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcd213538aead8b799417db45facac75a1a93568a5f1727faa231249d8f13ada6653de2555c3b57c004057"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/27/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."
}