[lalaland1125]

You are trusting those third parties to react accordingly. They could be paid off or attacked in other ways.

[gruez]

If you're dealing with amounts so large that you can't trust [large number] of independent third parties, you can always fall back to on-chain. but you've got to be pretty paranoid to think that starbucks is going to collude with [large number] of independent third parties to steal your $100 coffee deposit.