diff --git a/modules/sdk-coin-ton/src/lib/transaction.ts b/modules/sdk-coin-ton/src/lib/transaction.ts
index 681788cf8c..31cbf5c44f 100644
--- a/modules/sdk-coin-ton/src/lib/transaction.ts
+++ b/modules/sdk-coin-ton/src/lib/transaction.ts
@@ -59,12 +59,14 @@ export class Transaction extends BaseTransaction {
     const signingMessage = this.createSigningMessage(WALLET_ID, this.seqno, this.expireTime);
     const sendMode = 3;
     signingMessage.bits.writeUint8(sendMode);
-    signingMessage.refs.push(this.createOutMsg(this.recipient.address, this.recipient.amount, this.message));
+    const outMsg = this.createOutMsg(this.recipient.address, this.recipient.amount, this.message);
+    signingMessage.refs.push(outMsg);
     this.unsignedMessage = Buffer.from(await signingMessage.hash()).toString('hex');
 
     const signature =
       this._signatures.length > 0 ? this._signatures[0] : Buffer.from(new Uint8Array(64)).toString('hex');
     const finalMessage = await this.createExternalMessage(signingMessage, this.seqno, signature);
+
     this.finalMessage = TonWeb.utils.bytesToBase64(await finalMessage.toBoc(false));
 
     this._id = TonWeb.utils.bytesToBase64(await finalMessage.hash());
diff --git a/modules/sdk-coin-ton/src/lib/transactionBuilder.ts b/modules/sdk-coin-ton/src/lib/transactionBuilder.ts
index 2328e65e79..505edb5a81 100644
--- a/modules/sdk-coin-ton/src/lib/transactionBuilder.ts
+++ b/modules/sdk-coin-ton/src/lib/transactionBuilder.ts
@@ -45,7 +45,7 @@ export abstract class TransactionBuilder extends BaseTransactionBuilder {
 
   /** @inheritDoc */
   addSignature(publicKey: BasePublicKey, signature: Buffer): void {
-    this.transaction.signature.push(signature.toString('hex'));
+    this.transaction.signature[0] = signature.toString('hex');
   }
 
   /**
@@ -73,12 +73,6 @@ export abstract class TransactionBuilder extends BaseTransactionBuilder {
   /** @inheritdoc */
   protected async buildImplementation(): Promise<Transaction> {
     await this.transaction.build();
-    //    if (this.si) {
-    //      this.transaction.sign(this._signer);
-    //    }
-    //    if (this._signatures?.length > 0) {
-    //      this.transaction.constructSignedPayload(this._signatures[0].signature);
-    //    }
     this.transaction.loadInputsAndOutputs();
     return this.transaction;
   }
diff --git a/modules/sdk-coin-ton/test/unit/transferBuilder.ts b/modules/sdk-coin-ton/test/unit/transferBuilder.ts
index f14b354190..aa0f5135b5 100644
--- a/modules/sdk-coin-ton/test/unit/transferBuilder.ts
+++ b/modules/sdk-coin-ton/test/unit/transferBuilder.ts
@@ -41,6 +41,7 @@ describe('Ton Transfer Builder', () => {
   it('should build a send from rawTx', async function () {
     const txBuilder = factory.from(testData.signedTransaction.tx);
     const builtTx = await txBuilder.build();
+    const jsonTx = builtTx.toJson();
     should.equal(builtTx.type, TransactionType.Send);
     should.equal(builtTx.signablePayload.toString('base64'), testData.signedTransaction.signable);
     //    should.equal(builtTx.id, testData.signedTransaction.txId);
@@ -50,7 +51,6 @@ describe('Ton Transfer Builder', () => {
     should.equal(builtTx.toBroadcastFormat(), testData.signedTransaction.tx);
     builtTx.inputs.length.should.equal(1);
     builtTx.outputs.length.should.equal(1);
-    const jsonTx = builtTx.toJson();
     jsonTx.sender.should.equal('EQCSBjR3fUOL98WTw2F_IT4BrcqjZJWVLWUSz5WQDpaL9Jpl');
     jsonTx.destination.should.equal('EQA0i8-CdGnF_DhUHHf92R1ONH6sIA9vLZ_WLcCIhfBBXwtG');
     jsonTx.amount.should.equal('10000000');
@@ -82,16 +82,14 @@ describe('Ton Transfer Builder', () => {
     should.equal(tx.type, TransactionType.Send);
     const signable = tx.signablePayload;
     const signature = keyPair.signMessageinUint8Array(signable);
-    txBuilder.addSignature(keyPair.getKeys(), Buffer.from(signature));
     const signedTx = await txBuilder.build();
     const builder2 = factory.from(signedTx.toBroadcastFormat());
+    builder2.addSignature(keyPair.getKeys(), Buffer.from(signature));
     const tx2 = await builder2.build();
     const signature2 = keyPair.signMessageinUint8Array(tx2.signablePayload);
     should.equal(Buffer.from(signature).toString('hex'), Buffer.from(signature2).toString('hex'));
-    should.equal(tx.toBroadcastFormat(), tx2.toBroadcastFormat());
-
     await new Promise((resolve) => setTimeout(resolve, 2000));
-    const result = await tonweb.provider.sendBoc(signedTx.toBroadcastFormat());
+    const result = await tonweb.provider.sendBoc(tx2.toBroadcastFormat());
     console.log(JSON.stringify(result));
   });