What our servers can see

The application runs on your computer. Our servers are only used by the online features, and they are designed to hold as little as possible.

Local (offline)

These never leave your computer:

They are stored in your wallet folder, encrypted. See How your data is protected.

The bitcoin wallet connects to the Bitcoin network to read balances and send payments. The offline tools need no connection at all.

When you log in anonymously, this is what exists on our side.

What	Can we read it?
Your user name and the public key behind it	Yes. It is a key of your wallet made only for logging in. It is not your name or your e-mail, and it is not one of your bitcoin addresses.
Your contacts	No. The list is encrypted on your computer before it is sent, with a new key every time it changes.
Your groups: who is in them, their shares, their settings	No. Each group is encrypted with a key that only its members have.
Messages between users (invitations, group messages, signatures)	No. Each one is encrypted for the person who must read it. Messages are deleted once they have been delivered.
Chat	No. It travels over Nostr relays, encrypted for your contact.
Files you encrypt for other users	We never receive them. You send the encrypted file yourself, any way you like.
Your bitcoin addresses	Balances are read from an Electrum server. As with any light wallet, the server that answers sees which addresses are asked about. They are not part of your user account. You can use your own Electrum server.

To be clear about the limits:

It knows that a user name exists, and when it connects.
It knows that encrypted blobs belong to a user name, and their size.
To deliver a message it has to know which user name the message is for.
Like any internet service, it sees the network address (IP) a connection comes from. Use a VPN or Tor if that matters to you.

There is no registration form. We do not ask for a name, an e-mail or a phone number, so we have none to lose, sell or hand over.

Your bitcoin is not affected. Your wallet is standard (BIP 39 and BIP 86) and can be restored with your words and your password, in this application or in other software that supports those standards.
Your offline tools keep working.
The online features (contacts, chat, Smart Groups) need the servers.