Im thinking more along the lines of utilizing Zaps in Nostr to actually move the sats around when they find the cache. But, I haven't dug into the technical details of that, so I have no idea it would need to be in practice. I also haven't tried finding a cache yet, so I don't have a good understanding of your current state :) 

ah yep, I've got nostr/lightning login in the todo list. People who find the cache currently get sats but do you mean other random people could tip/zap them for finding the cache?

questforsats

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Well, firstly I'd like to just be able to sign in using Nostr, instead of giving my email address. Beyond that though, you could try to do something with Zapping to get sats to people who find a cache. I dont know how you could actually implement that, but it's worth considering. 