M3VTIZCPE7CMJXRENE7J3DYEXA4KILMNYLPMPCDRCWXTJ34JKSCQC
SXEYMYF7P4RZMZ46WPL4IZUTSQ2ATBWYZX7QNVMS3SGOYXYOHAGQC
} else if self.change.is_some() {
} else if let Some(ref chg) = self.change { txn.hash_from_prefix(&chg)?;
} else if let Some(ref chg) = self.change {
txn.hash_from_prefix(&chg)?;