A verification node in a trust management system manages, in a blockchain, a smart contract and an execution transaction of the smart contract as well as an evaluation execution transaction for the smart contract. The verification node includes and manages a verification result of the smart contract in the evaluation execution transaction, the verification result including a predetermined value for evaluation specified by a predetermined one of transaction issuing nodes and an output value obtained when the predetermined value is inputted to the smart contract, or includes and manages the output value in state information.