Keylight Uses Ed25519 Signatures to Verify Software Licenses Offline Without Server Calls

Keylight is a software licensing platform that validates license keys locally using Ed25519 cryptographic signatures, eliminating the need for network requests to a server. Each license is a self-describing signed document containing customer details, product ID, feature entitlements, activation limits, and expiry information. The app ships with a public key embedded in its binary, allowing it to verify the signature and confirm the license was issued by Keylight's private key without any database lookup. Because validity is proven mathematically rather than through a server check, licenses remain enforceable offline and during network outages. Activation limits are still enforced server-side when a device registers, but all other entitlement checks happen locally via the verified lease document.