This is a submission for the GitHub Finish-Up-A-Thon Challenge What I Built FadeKey is a zero-knowledge, self-destructing secret sharing engine. Encrypted entirely in the browser using AES-GCM, the decryption key resides only in the URL hash fragment ( #key=... ). Since browsers do not send the hash fragment in HTTP requests, the server never sees the key or plaintext. The project is divided into two distinct components: Public Open-Source Core: A standalone, stateless Fastify API and SDK packag