Thanks for your illuminating answer! I can go now and sleep soundly haha

cryotosensei

I assume these zaps are given by Stackers who have already indicated an external sending wallet address?

If the stacker that zaps you has a sending wallet attached, the sats go straight to your attached receiving wallet. If you have a balance in your SN wallet, when you zap someone the sats come out of your SN wallet, otherwise they come out of your attached sending wallet.

AskSN

What do these zaps mean?

> I assume these zaps are given by Stackers who have already indicated an external sending wallet address?

yes.

If the stacker that zaps you has a sending wallet attached, the sats go straight to your attached receiving wallet. If you have a balance in your SN wallet, when you zap someone the sats come out of your SN wallet, otherwise they come out of your attached sending wallet.