Generate your own signing key in your browser, then sign PLENA receipts locally. The private key never leaves your device and is never sent to PLENA. Your receipts verify anywhere, against your public key in the PLENA issuer registry. No account, no server — the same decentralized model as the public verifier.
This generates an Ed25519 keypair in your browser using Web Crypto. You keep the private key; you send PlenaProof only the public key to be listed in the issuer registry.
Load your private key, edit the receipt draft, and sign locally. The signed receipt can be published, shared, or uploaded to the public Verify page.