RE: Audit your authorities

That's up to you, it is largely considered safe by most.

Unless it gets compromised, the way Keychain works is it stores your keys locally in an encrypted format, when you request to do something, it decrypts your keys (with your master password) and signs a transaction and sends the signed transaction over to an RPC node (not including any of your keys).

This means your keys are never sent anywhere and only signed transactions are broadcasted. These signed transactions do not exposure your keys.

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