Sign in with a wallet or an email. Then use the network straight away in this browser, or install a node of your own.
Sign up
or
An email is recorded as a contact only - this node has no mail server, so nothing is sent and nothing is confirmed. A wallet is the identity that can actually be proven.
Create your key
One more signature - and this one is never sent anywhere. It derives the key that encrypts your data in this browser, so only your wallet can open it. Nothing is spent and no transaction is authorised.
Your network
or
These run against the node on your own machine, so install it first if you have not.