Imports github.com/golang/protobuf/proto github.com/hyperledger/cacti/weaver/common/protos-go/v2/common github.com/hyperledger/fabric-contract-api-go/contractapi github.com/hyperledger/fabric-protos-go/msp github.com/sirupsen/logrus Standard library imports crypto/sha256 crypto/sha512 encoding/base64 encoding/json errors fmt strconv time