The real issue (beyond verifying it) is "making change"
I also thought of this. If I tried to buy a cup of coffee with my bar of gold and the person said they'd love to accept gold, I need to now scrape off a coffee-worth of gold. To get that exactly right...well...not easy.
I also thought of this. If I tried to buy a cup of coffee with my bar of gold and the person said they'd love to accept gold, I need to now scrape off a coffee-worth of gold. To get that exactly right...well...not easy.