Algorithm 2: Trust Management Based on Smart Contract.

Input: Fusion trust Output: Ledger begin 1:         % InitTrust: Initialize the ledger and assign initial values to the trust values. 2:         define a structure Trust containing N,${id}_1$,${id}_2$,t,${trust}_1$,${trust}_2$ 3:         Assign an initial value to each structure element 4:         % CreateTrust: Set a new trust record. 5:         Define a newly written trust value 6:         Check if the trust value is repeated 7:         if not repeated then 8:             return ctx.GetStub().PutState(N,${id}_1$,${id}_2$,t,${trust}_1$,${trust}_2$) 9:         end if 10:       % ReadTrust: Read a trust record. 11:       ctx.GetStub().GetState(N,${id}_1$,${id}_2$,t,${trust}_1$,${trust}_2$) 12:       % UpdateTrust: Update the trust value. 13:       Change the value of trust 14:       Check if the trust value is repeated 15:       if not repeated then 16:           return ctx.GetStub().PutState(N,${id}_1$,${id}_2$,t,${trust}_1$,${trust}_2$) 17:       end if 18:    % DeleteTrust: Delete a trust record. 19:    return ctx.GetStub().DelState(N,${id}_1$,${id}_2$,t,${trust}_1$,${trust}_2$) end