diff --git a/src/app/CoinCointrol.ts b/src/app/CoinCointrol.ts
new file mode 100644
index 00000000..1b000868
--- /dev/null
+++ b/src/app/CoinCointrol.ts
@@ -0,0 +1,87 @@
+import * as bitcoin from 'bitcoinjs-lib';
+
+interface UTXO {
+    txid: string;
+    index: number;
+    txout: bitcoin.TxOut;
+    address: bitcoin.Address;
+}
+
+interface Wallet {
+    utxos: UTXO[];
+    privateKeys: Record<string, bitcoin.ECPair.ECPairInterface>;
+}
+
+function addUTXO(wallet: Wallet, txid: string, index: number, txout: bitcoin.TxOut, address: bitcoin.Address) {
+    wallet.utxos.push({ txid, index, txout, address });
+}
+
+function removeUTXO(wallet: Wallet, txid: string) {
+    wallet.utxos = wallet.utxos.filter(utxo => utxo.txid !== txid);
+}
+
+function selectUTXOs(wallet: Wallet, amount: number): UTXO[] {
+    let selectedUTXOs: UTXO[] = [];
+    let totalAmount = 0;
+
+    for (const utxo of wallet.utxos) {
+        totalAmount += utxo.txout.value;
+
+        selectedUTXOs.push(utxo);
+
+        if (totalAmount >= amount) {
+            break;
+        }
+    }
+
+    return selectedUTXOs;
+}
+
+function createTransaction(selectedUTXOs: UTXO[], outputs: { address: bitcoin.Address; amount: number }[]): bitcoin.Transaction {
+    const txb = new bitcoin.TransactionBuilder();
+    for (const utxo of selectedUTXOs) {
+        txb.addInput(utxo.txid, utxo.index);
+    }
+
+    for (const { address, amount } of outputs) {
+        txb.addOutput(address, amount);
+    }
+
+    return txb.buildIncomplete();
+}
+
+function signTransaction(wallet: Wallet, transaction: bitcoin.Transaction, selectedUTXOs: UTXO[]) {
+    for (let i = 0; i < selectedUTXOs.length; i++) {
+        const utxo = selectedUTXOs[i];
+        const key = wallet.privateKeys[utxo.address.toString()];
+        transaction.sign(i, key);
+    }
+}
+
+// Example usage
+const wallet: Wallet = {
+    utxos: [],
+    privateKeys: {}
+};
+
+// Add UTXOs to the wallet
+// addUTXO(wallet, ...);
+
+// Specify the amount and recipient address
+const amount = 10000000; // satoshis
+const recipientAddress = 'recipient_address';
+
+// Select UTXOs for the transaction
+const selectedUTXOs = selectUTXOs(wallet, amount);
+
+// Create transaction outputs
+const outputs = [{ address: recipientAddress, amount }];
+
+// Create the transaction
+const transaction = createTransaction(selectedUTXOs, outputs);
+
+// Sign the transaction
+signTransaction(wallet, transaction, selectedUTXOs);
+
+// Broadcast the transaction
+// broadcastTransaction(transaction);
diff --git a/src/app/bitcoin b/src/app/bitcoin
new file mode 100644
index 00000000..e69de29b