Imports github.com/swzchain/zwschain/common github.com/swzchain/zwschain/contracts/shim github.com/swzchain/zwschain/core/vmContractPub/protos/peer github.com/swzchain/zwschain/dag/constants github.com/swzchain/zwschain/dag/modules Standard library imports crypto/x509 crypto/x509/pkix encoding/json fmt math/big sort strconv strings time