endorsement

type SigningIdentity interface {
	//serialize返回用于验证的此标识的字节表示形式
	//由此签名身份签名的邮件
	Serialize() ([]byte, error)

	//sign对给定的有效负载进行签名并返回签名
	Sign([]byte) ([]byte, error)
}

type SigningIdentityFetcher interface {
	endorsement.Dependency
	//SigningIdentityForRequest返回给定建议的签名标识
	SigningIdentityForRequest(*peer.SignedProposal) (SigningIdentity, error)
}