New Address Generation

This is normal. By default and for privacy, every transaction generates a new wallet address though you still receive payments sent to any former addresses.

If you want to see a full list of your wallet addresses, go to the “Terminal” view and type

wallet addresses

Receiving SCP While Syncing

Yes. Once you have created a wallet and generated an address, you can start to send coins to that address. Your coins will appear in your wallet once the SiaPrime client has fully synchronized.