Add Wallet::verify_tx

Verify that a tx meets bitcoinconsensus

Author: jbesraa

Cargo.toml

@@ -59,7 +59,7 @@ bdk = { version = "0.29.0", default-features = false, features = ["std", "async-
 
 reqwest = { version = "0.11", default-features = false, features = ["json", "rustls-tls"] }
 rusqlite = { version = "0.28.0", features = ["bundled"] }
-bitcoin = "0.30.2"
+bitcoin = { version = "0.30.2", features = ["bitcoinconsensus"] }
 bip39 = "2.0.0"
 
 rand = "0.8.5"

src/wallet.rs

@@ -25,8 +25,9 @@ use bitcoin::blockdata::locktime::absolute::LockTime;
 use bitcoin::secp256k1::ecdh::SharedSecret;
 use bitcoin::secp256k1::ecdsa::{RecoverableSignature, Signature};
 use bitcoin::secp256k1::{PublicKey, Scalar, Secp256k1, SecretKey, Signing};
-use bitcoin::{ScriptBuf, Transaction, TxOut, Txid};
+use bitcoin::{bitcoinconsensus, ScriptBuf, Transaction, TxOut, Txid};
 
+use std::collections::HashMap;
 use std::ops::Deref;
 use std::sync::{Arc, Condvar, Mutex};
 use std::time::Duration;
@@ -116,6 +117,29 @@ where
 		Ok(self.inner.lock().unwrap().is_mine(script)?)
 	}
 
+	pub async fn verify_tx(&self, tx: Transaction) -> Result<(), Error> {
+		let serialized_tx = bitcoin::consensus::serialize(&tx);
+		for (index, input) in tx.input.iter().enumerate() {
+			let input = input.clone();
+			let txid = input.previous_output.txid;
+			let prev_tx = if let Ok(prev_tx) = self.blockchain.get_tx(&txid).await {
+				prev_tx.unwrap()
+			} else {
+				dbg!("maybe conibase?");
+				continue;
+			};
+			let spent_output = prev_tx.output.get(input.previous_output.vout as usize).unwrap();
+			bitcoinconsensus::verify(
+				&spent_output.script_pubkey.to_bytes(),
+				spent_output.value,
+				&serialized_tx,
+				index,
+			)
+			.unwrap();
+		}
+		Ok(())
+	}
+
 	pub(crate) fn sign_tx(&self, psbt: &Psbt, options: Option<SignOptions>) -> Result<Psbt, Error> {
 		let wallet = self.inner.lock().unwrap();
 		let mut psbt = psbt.clone();