Bitcoin network check when building PSBT

This ensures that funds are not sent to an address on the wrong network.

CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- An issue where ASB Bitcoin withdrawal can be done to an address on the wrong network.
+  A network check was added that compares the wallet's network against the network of the given address when building the transaction.
+
 ## [0.6.0] - 2021-05-24
 
 ### Added

swap/src/bitcoin/wallet.rs

@@ -303,6 +303,10 @@ where
         address: Address,
         amount: Amount,
     ) -> Result<PartiallySignedTransaction> {
+        if self.network != address.network {
+            bail!("Cannot build PSBT because network of given address is {} but wallet is on network {}", address.network, self.network);
+        }
+
         let wallet = self.wallet.lock().await;
         let client = self.client.lock().await;
         let fee_rate = client.estimate_feerate(self.target_block)?;