diff --git a/packages/controller/src/utils/solana/index.ts b/packages/controller/src/utils/solana/index.ts
index 70d5efe9a2..bb3b4f8edb 100644
--- a/packages/controller/src/utils/solana/index.ts
+++ b/packages/controller/src/utils/solana/index.ts
@@ -90,6 +90,7 @@ export class Transaction {
     // Build transaction using micro-sol-signer
     if (this._transaction) {
       // If we have a decoded transaction, re-serialize it
+      console.log("[Transaction.serialize] Re-encoding existing transaction");
       return Buffer.from(sol.Transaction.encode(this._transaction));
     }
 
@@ -98,13 +99,38 @@ export class Transaction {
       throw new Error("Transaction requires feePayer and recentBlockhash");
     }
 
-    const txHex = sol.createTxComplex(
+    console.log(
+      "[Transaction.serialize] Building new transaction with",
+      this._instructions.length,
+      "instructions",
+    );
+    console.log("[Transaction.serialize] feePayer:", this.feePayer.toString());
+    console.log(
+      "[Transaction.serialize] recentBlockhash:",
+      this.recentBlockhash,
+    );
+
+    // Use createTxComplex which returns a base64-encoded transaction with empty signatures
+    const txBase64 = sol.createTxComplex(
       this.feePayer.toString(),
       this._instructions,
       this.recentBlockhash,
     );
 
-    return Buffer.from(txHex, "hex");
+    console.log(
+      "[Transaction.serialize] createTxComplex returned base64 length:",
+      txBase64.length,
+    );
+
+    // Decode the base64 string to get the transaction bytes
+    const buffer = Buffer.from(txBase64, "base64");
+    console.log("[Transaction.serialize] Final buffer length:", buffer.length);
+    console.log(
+      "[Transaction.serialize] First 32 bytes:",
+      Array.from(buffer.slice(0, 32)),
+    );
+
+    return buffer;
   }
 
   serializeMessage(): Buffer {
diff --git a/packages/controller/src/wallets/phantom/index.ts b/packages/controller/src/wallets/phantom/index.ts
index ef9d3833c1..e4177cdffa 100644
--- a/packages/controller/src/wallets/phantom/index.ts
+++ b/packages/controller/src/wallets/phantom/index.ts
@@ -135,7 +135,25 @@ export class PhantomWallet implements WalletAdapter {
     }
 
     try {
+      console.log(
+        "[PhantomWallet.sendTransaction] Received serialized_txn length:",
+        serailized_txn.length,
+      );
+      console.log(
+        "[PhantomWallet.sendTransaction] First 32 bytes:",
+        Array.from(serailized_txn.slice(0, 32)),
+      );
+      console.log(
+        "[PhantomWallet.sendTransaction] Deserializing with Transaction.from...",
+      );
+
       const txn = Transaction.from(serailized_txn);
+
+      console.log("[PhantomWallet.sendTransaction] Successfully deserialized");
+      console.log(
+        "[PhantomWallet.sendTransaction] Sending to Phantom provider...",
+      );
+
       const provider = this.getProvider();
       const result = await provider.signAndSendTransaction(txn);
       return {
diff --git a/packages/keychain/src/utils/solana/index.ts b/packages/keychain/src/utils/solana/index.ts
index a77ee5fa5a..b1ebd87463 100644
--- a/packages/keychain/src/utils/solana/index.ts
+++ b/packages/keychain/src/utils/solana/index.ts
@@ -149,15 +149,42 @@ export class Transaction {
       throw new Error("Transaction requires feePayer and recentBlockhash");
     }
 
-    // Create the transaction with micro-sol-signer
-    const txHex = sol.createTxComplex(
+    console.log(
+      "[keychain/Transaction.serialize] Building transaction with",
+      this.instructions.length,
+      "instructions",
+    );
+    console.log(
+      "[keychain/Transaction.serialize] feePayer:",
+      this.feePayer.toString(),
+    );
+    console.log(
+      "[keychain/Transaction.serialize] recentBlockhash:",
+      this.recentBlockhash,
+    );
+
+    // createTxComplex returns a base64-encoded string, not hex!
+    const txBase64 = sol.createTxComplex(
       this.feePayer.toString(),
       this.instructions,
       this.recentBlockhash,
     );
 
-    // Convert hex string to Uint8Array
-    return new Uint8Array(Buffer.from(txHex, "hex"));
+    console.log(
+      "[keychain/Transaction.serialize] createTxComplex returned base64 length:",
+      txBase64.length,
+    );
+
+    // Decode the base64 string to get the transaction bytes
+    const buffer = new Uint8Array(Buffer.from(txBase64, "base64"));
+
+    console.log("[keychain/Transaction.serialize] Final buffer length:", buffer.length);
+    console.log(
+      "[keychain/Transaction.serialize] First 32 bytes:",
+      Array.from(buffer.slice(0, 32)),
+    );
+
+    return buffer;
   }
 }