If you look at their forum you can find more about their beta client. The signal app acts as a light wallet. Right now it generates keys and encrypts then with

If you look at their forum you can find more about their beta client. The signal app acts as a light wallet. Right now it generates keys and encrypts then with your signal pin. You can also restore them from the recovery phrase. The term non-custodial means that Signal never has access to your keys and cannot send funds on your behalf.