// Create a sha hash from the message binary (output of BtcEncode)
func (msg *MsgRevealChain) Sha() (interfaces.IHash, error) {
buf := bytes.NewBuffer(nil)
msg.BtcEncode(buf, ProtocolVersion)
var sha interfaces.IHash
_ = sha.SetBytes(Sha256(buf.Bytes()))
return sha, nil
}