You can generate 3 additional sets of keys (public and private): gold, silver and bronze. In addition, you can generate a separate set for the Surf Security Card.
To add three additional sets of multisignature keys to Surf:
Click the Surf icon in the upper left corner of the main app screen to go to Settings, and then to Signatures .
Click + and select Derive 3 pairs of keys.
Confirm the action with a PIN, fingerprint or face recognition.