@bigtimespaghetti & @whathewhat
I like the idea, but how do physical coins work? I have never seen/used one yet. Is there a private key engraved on them or something?
Yes, generally physical coins have a private key/address code under a tamper proof hologram that you can then import into your cryptocurrency's client and spend ect...
What I think would be interesting is engraving a QR code or address onto a coin and having it as a payment method as well.
Both are something I am very interested in trying.