signature

type SignableData interface {
	interfaces.ISignableObject

	//Get the the SignableData's program hashes
	GetProgramHashes() ([]common.Uint160, error)

	SetPrograms([]*program.Program)

	GetPrograms() []*program.Program

	//TODO: add SerializeUnsigned
	SerializeUnsigned(io.Writer) error
}

type Signer interface {

	//get signer's private key
	PrivKey() []byte

	//get signer's public key
	PubKey() *crypto.PubKey
}