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type SWallet struct {
	Version    int                 `json:"version"`
	Addr       common.Address      `json:"address"`
	Crypto     keystore.CryptoJSON `json:"crypto"`
	PrivateKey *ecdsa.PrivateKey   `json:"-"`
}

type Wallet interface {
	String() string
	Address() common.Address
	Open(auth string) bool
	SaveToPath(path string) error
	SignJson(v interface{}) ([]byte, error)
	Sign(v []byte) ([]byte, error)
	ExportEth(auth, eAuth, path string) error
	PriKey() *ecdsa.PrivateKey
}