Abstract: In traditional service-oriented architecture(SOA),web service providers register their service descriptions in the registry for service consumers to discover and invoke services.Traditional SOA lacks dispute resolution mechanism,so that the trusted service invocation between service consumers and providers can not be guaranteed.Blockchain can be reasonably introduced into the dispute resolution mechanism due to its significant advantages in decentralization and tamper resistance.Therefore,this paper proposes a trusted SOA architecture based on blockchain,in which blockchain acts as evidence recorder and service registry agent. During a service trusted invocation,the service consumer first encrypts the parameters and sends them to the target service provider.Secondly,the service provider receives the encryption parameters and decrypts them.Then,the service provider completes the service execution and encrypts the output result.Finally,when the service provider sends the encryption result to the service consumer,it completes the trusted credential construction and uplink.Based on the above,when a service dispute occurs,it will trigger the adjudication of the smart contract.The execution of the contract relies on trusted vouchers to correctly handle service disputes.Experimental results show that,compared with the traditional invocation,the proposed method can correctly handle the service disputes between service providers and requesters on the premise of ensuring that the growth rate of trusted invocation time of most services is no more than 30%.

Key words: Blockchain, Blockchain-based service description model, Trusted credential, Trusted invocation, Dispute resolution mechanism