self.outputs[0].1 ); } } } Ok(self) } fn add_value(mut self) -> Result<Self> { let estimated_fee = self.estimate_fee(); let min_value = match self.target { Target::Postage => self.outputs.last().unwrap().0.script_pubkey().dust_value(), Target::Value(value) | Target::ExactPostage(value) => value, }; let total = min_value .checked_add(estimated_fee) .ok_or(Error::ValueOverflow)?; if let Some(mut deficit) = total.checked_sub(self.outputs.last().unwrap().1) { while deficit > Amount::ZERO { let additional_fee = self.fee_rate.fee(Self::ADDITIONAL_INPUT_VBYTES); let needed = deficit .checked_add(additional_fee) .ok_or(Error::ValueOverflow)?; let (utxo, value) = self.select_cardinal_utxo(needed, false)?; let benefit = value .checked_sub(additional_fee) .ok_or(Error::NotEnoughCardinalUtxos)?; self.inputs.push(utxo); self.outputs.last_mut().unwrap().1 += value;