Either neither party can trust the other, and you need an intermediary to at least verify who won, and possibly to transfer the money; or both people are trustw

Either neither party can trust the other, and you need an intermediary to at least verify who won, and possibly to transfer the money; or both people are trustworthy and you can have a simple agreement. If it’s a third party, you have to trust that third party. We can’t get rid of the trust requirement. If the third party is software, what if there is a bug ? More like, when there are bugs