I just see these in my server logs when someone generates a link:
INFO: [cloudflare ip]:47174 - "POST /generate_link HTTP/1.1" 200 OK
INFO: [cloudflare ip]:47174 - "POST /generate_link HTTP/1.1" 200 OK
(That would be a test message I created a link for)
If someone were to go to just the /sha256/sha256 link without the encryption key bookmark appended to it, they would see: Decryption failed: ChaCha20Poly1305 key must be 32 bytes.
Or with a wrong key they would see: Decryption failed: