NEVER! & I mean NEVER Share your main key with a soul. Not a guardian, not a platform and no friends nor family members. NOBODY! EVER! All of your funds will be compromised if you share the main key(seed phrase). Guardian is purely for recovery in case you lose your main key(seed phrase). The public key is what you give people or platforms to send or receive. But with a non custodial account, please remember........With great power comes very great responsibility.