} let expected_fee = self.fee_rate.fee(modified_tx.vsize()); assert_eq!( actual_fee, expected_fee, "invariant: fee estimation is correct", ); for tx_out in &transaction.output { assert!( Amount::from_sat(tx_out.value) >= tx_out.script_pubkey.dust_value(), "invariant: all outputs are above dust limit", ); } Ok(transaction) } fn calculate_sat_offset(&self) -> u64 { let mut sat_offset = 0; for outpoint in &self.inputs { if *outpoint == self.outgoing.outpoint { return sat_offset + self.outgoing.offset; } else { sat_offset += self.amounts[outpoint].to_sat(); } } panic!("Could not find outgoing sat in inputs"); } /// Cardinal UTXOs are those that contain no inscriptions and can therefore /// be used to pad transactions. Sometimes multiple of these UTXOs are needed /// and depending on the context we want to select either ones above or /// under (when trying to consolidate dust outputs) the target value.