Thanks for the suggestions :) The reason it says 'sats' is because of the decimal places, but perhaps there could be two variations of the card - one that says sats and the other that says bitcoin. Also thinking about adding a FAQ section, so things can be clarified for newcomers. Additionally I might split cards into two categories - one for close friends (who can take the offensive tone) and the other for everyone else (as suggested by @sb in this thread).