diff --git a/src/commands/tx.rs b/src/commands/tx.rs
index e6cbb24..5bafa85 100644
--- a/src/commands/tx.rs
+++ b/src/commands/tx.rs
@@ -80,6 +80,20 @@ fn run_register_collection(
     passphrase: Option<String>,
 ) -> Result<()> {
     let wallet = load_wallet(ctx)?;
+    let mut lock_outpoints = Vec::new();
+    let db_path = ctx.data_dir.join("brc721.sqlite");
+    if db_path.exists() {
+        let storage = crate::storage::SqliteStorage::new(&db_path);
+        let wallet_utxos = wallet.list_unspent(0).context("list wallet UTXOs")?;
+        lock_outpoints = compute_wallet_token_outpoints_to_lock(&storage, &wallet_utxos, &[])
+            .context("compute lock set")?;
+    } else {
+        log::warn!(
+            "scanner database not found at {} (proceeding without ownership UTXO locks)",
+            db_path.to_string_lossy()
+        );
+    }
+
     let msg = RegisterCollectionData {
         evm_collection_address,
         rebaseable,
@@ -91,7 +105,7 @@ fn run_register_collection(
 
     let passphrase = resolve_passphrase(passphrase)?;
     let tx = wallet
-        .build_tx(output, fee_rate, passphrase)
+        .build_tx(output, fee_rate, &lock_outpoints, passphrase)
         .context("build tx")?;
     let txid = wallet.broadcast(&tx)?;
 
@@ -112,6 +126,19 @@ fn run_register_ownership(
     passphrase: Option<String>,
 ) -> Result<()> {
     let mut wallet = load_wallet(ctx)?;
+    let mut lock_outpoints = Vec::new();
+    let db_path = ctx.data_dir.join("brc721.sqlite");
+    if db_path.exists() {
+        let storage = crate::storage::SqliteStorage::new(&db_path);
+        let wallet_utxos = wallet.list_unspent(0).context("list wallet UTXOs")?;
+        lock_outpoints = compute_wallet_token_outpoints_to_lock(&storage, &wallet_utxos, &[])
+            .context("compute lock set")?;
+    } else {
+        log::warn!(
+            "scanner database not found at {} (proceeding without ownership UTXO locks)",
+            db_path.to_string_lossy()
+        );
+    }
 
     // Output 1 is the ownership UTXO tracked by the indexer for this registration.
     // Use a new wallet-derived address so the NFTs are spendable by this wallet.
@@ -138,6 +165,7 @@ fn run_register_ownership(
             output,
             vec![(ownership_address.clone(), ownership_amount)],
             fee_rate,
+            &lock_outpoints,
             passphrase,
         )
         .context("build tx")?;
diff --git a/src/integration_tests/txs.rs b/src/integration_tests/txs.rs
index ae82604..5a4c8d3 100644
--- a/src/integration_tests/txs.rs
+++ b/src/integration_tests/txs.rs
@@ -4,7 +4,7 @@ use crate::{
 };
 use age::secrecy::SecretString;
 use bdk_wallet::bip39::{Language, Mnemonic};
-use bitcoin::{Amount, Network};
+use bitcoin::{Amount, Network, OutPoint};
 use bitcoincore_rpc::{Auth, Client, RpcApi};
 use corepc_node::Node;
 use ethereum_types::H160;
@@ -48,10 +48,12 @@ fn test_build_tx_creates_signed_tx_with_custom_output() {
         output.script_pubkey.to_string(),
         "OP_RETURN OP_PUSHNUM_15 OP_PUSHBYTES_22 00000000000000000000000000000000000000000000"
     );
+    let lock_outpoints: Vec<OutPoint> = Vec::new();
     let tx = wallet
         .build_tx(
             output,
             Some(1.5),
+            &lock_outpoints,
             SecretString::from("passphrase".to_string()),
         )
         .expect("build tx");
diff --git a/src/wallet/brc721_wallet.rs b/src/wallet/brc721_wallet.rs
index 1161030..19f44bb 100644
--- a/src/wallet/brc721_wallet.rs
+++ b/src/wallet/brc721_wallet.rs
@@ -116,12 +116,28 @@ impl Brc721Wallet {
         &self,
         output: bitcoin::TxOut,
         fee_rate: Option<f64>,
+        lock_outpoints: &[OutPoint],
         passphrase: SecretString,
     ) -> Result<bitcoin::Transaction> {
-        let psbt = self
-            .remote
-            .create_psbt_from_txout(output, fee_rate)
-            .context("create psbt from outputs")?;
+        let locked = self.remote.list_locked_unspent()?;
+        let to_lock = lock_outpoints
+            .iter()
+            .filter(|outpoint| !locked.contains(outpoint))
+            .cloned()
+            .collect::<Vec<_>>();
+
+        self.remote
+            .lock_unspent_outpoints(&to_lock)
+            .context("lock token outpoints")?;
+
+        let psbt_res = self.remote.create_psbt_from_txout(output, fee_rate);
+
+        let unlock_res = self.remote.unlock_unspent_outpoints(&to_lock);
+        if let Err(unlock_err) = unlock_res {
+            log::warn!("Failed to unlock outpoints: {unlock_err:#}");
+        }
+
+        let psbt = psbt_res.context("create psbt from outputs")?;
 
         self.sign(psbt, &passphrase)
     }
@@ -131,12 +147,30 @@ impl Brc721Wallet {
         op_return: bitcoin::TxOut,
         payments: Vec<(Address, Amount)>,
         fee_rate: Option<f64>,
+        lock_outpoints: &[OutPoint],
         passphrase: SecretString,
     ) -> Result<bitcoin::Transaction> {
-        let psbt = self
+        let locked = self.remote.list_locked_unspent()?;
+        let to_lock = lock_outpoints
+            .iter()
+            .filter(|outpoint| !locked.contains(outpoint))
+            .cloned()
+            .collect::<Vec<_>>();
+
+        self.remote
+            .lock_unspent_outpoints(&to_lock)
+            .context("lock token outpoints")?;
+
+        let psbt_res = self
             .remote
-            .create_psbt_from_opreturn_and_payments(op_return, payments, fee_rate)
-            .context("create psbt from op_return + payments")?;
+            .create_psbt_from_opreturn_and_payments(op_return, payments, fee_rate);
+
+        let unlock_res = self.remote.unlock_unspent_outpoints(&to_lock);
+        if let Err(unlock_err) = unlock_res {
+            log::warn!("Failed to unlock outpoints: {unlock_err:#}");
+        }
+
+        let psbt = psbt_res.context("create psbt from op_return + payments")?;
 
         self.sign(psbt, &passphrase)
     }