Imports github.com/decred/dcrd/dcrec/secp256k1 github.com/golang/protobuf/proto github.com/hyperledger/fabric/common/util github.com/hyperledger/fabric/core/chaincode/shim github.com/hyperledger/fabric/protos/msp github.com/hyperledger/fabric/protos/peer Standard library imports crypto/sha256 encoding/hex encoding/json fmt strconv