escrow

The smart contract acted as escrow, holding funds until both buyer and seller confirmed the transaction.智能合约充当了第三方托管的角色，在买卖双方确认交易之前一直持有资金。

On-chain escrow eliminates the need for a trusted intermediary, reducing costs and removing single points of failure.链上托管消除了对受信任中介的需求，降低了成本并消除了单点故障。