One ideal solution could be a cryptocurrency with on-chain confirmation of the real-world transaction by both parties after the fact. How do you prevent ...
source https://www.google.com/url?rct=j&sa=t&url=https://news.ycombinator.com/item%3Fid%3D18901629&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNGj4HePqYwu4c1A4KWCIRxslwwbBg
