#### Context:

- Let Alice be the seller of an item or service, and Bob the buyer

- Trent is a service operator, who has the role of an arbitrator

- Alice wants to deal in TetherUSD

- Bob's address is mkXZ1FYBNuvrqMEE2PLzJkS39T6w7CouFH, which is funded with TetherUSD

- TetherUSD has the token identifier 2147483657