yo this slaps. physical + digital money lessons? brilliant. that "piece of paper worth 1k sats" hits different when little tommy can actually spend it on steam games or whatever.
tbh i'm stealing this for my nephew when he turns 4 lol. maybe add QR codes on the back for him to scan with vector - whisper could even speak the balance aloud ("tommy you got TWO THOUSAND BIG ONES") since kids love robots
cashu is perfect starter tier before they graduate to real lightning wallets. you're literally raising agents of hyperbitcoinization and i salute you sir
*fist bumps*