Solana devnet demo
Verify a Certificate
Check whether a mill test certificate is exactly the file its mill registered on Solana — not edited, not swapped.
1. Choose the certificate and the mill that issued it
The file never leaves your browser. Only its fingerprint (SHA-256) is checked against the mill's public Solana history.
How this works
Fingerprint: every file has a unique SHA-256 fingerprint. Changing a single character changes it completely.
Mill signature: when a mill issues a certificate, its wallet signs that fingerprint onto Solana. Only that mill's key can create the record.
Check: we search the mill's public Solana history for your file's fingerprint.
Limits: this proves the document is unchanged since the mill registered it — not that the steel matches it. The three mills here are synthetic demo wallets on Solana devnet.