Proof Garden records a tiny cryptographic fingerprint of a file on Daisybee Gardennet. The file itself is never uploaded or stored on the blockchain.
Choose a file. SHA-256 is calculated locally in your browser. Only the resulting 32-byte fingerprint is sent to Proof Garden.
Choose the file again and enter the Daisybee transaction ID. Proof Garden recalculates its fingerprint locally and compares it with the commitment recorded in that transaction.