🎱 MiRo BINGO — Fair Draw Verifier

Independent offline report checker • Gold Edition v1.4

Upload a finished-round audit JSON and the SHA-256 commitment recorded before the first ball. The checker verifies that the revealed draw order and every automatic pick match the recorded commitment.

Finished-round audit JSON Optional pre-draw commitment certificate (JSON) Or paste the independently recorded 64-character SHA-256 commitment

Choose an audit file, then select Verify.

What a valid report proves

A matching SHA-256 commitment means the exported shuffle, nonce, round settings and ID agree with the hash. Each automatic call must be the first eligible ball in the committed order, allowing for labeled manual calls and recorded removals. The final draw list must match the event log.

Limitation: The report alone cannot prove that its hash was published before play. A certificate's file timestamp can be edited. Keep the commitment externally recorded before starting, such as a message in a group chat. This does not certify the honesty of the software or device operator.

No uploads to any server. The entire verification runs in this browser. Secure SHA-256 requires WebCrypto support (usually available on HTTPS and modern local browsers).