diff --git a/src/i_logos_execution_zone_wallet_module.h b/src/i_logos_execution_zone_wallet_module.h
index ac89610..95b48a8 100644
--- a/src/i_logos_execution_zone_wallet_module.h
+++ b/src/i_logos_execution_zone_wallet_module.h
@@ -90,7 +90,7 @@ public:
 
     virtual QList<uint32_t> serialization_helper(const QList<uint8_t>& input_data) = 0;
 
-    virtual QList<uint8_t> authenticated_transfer_elf() = 0;
+    virtual QString authenticated_transfer_elf(QList<uint8_t>& output) = 0;
     virtual QList<uint8_t> token_elf() = 0;
     virtual QList<uint8_t> amm_elf() = 0;
     virtual QList<uint8_t> ata_elf() = 0;
diff --git a/src/logos_execution_zone_wallet_module.cpp b/src/logos_execution_zone_wallet_module.cpp
index 8baa34f..288272b 100644
--- a/src/logos_execution_zone_wallet_module.cpp
+++ b/src/logos_execution_zone_wallet_module.cpp
@@ -802,17 +802,16 @@ QList<uint8_t> LogosExecutionZoneWalletModule::ata_elf() {
     return result;
 }
 
-QList<uint8_t> LogosExecutionZoneWalletModule::authenticated_transfer_elf() {
+QString LogosExecutionZoneWalletModule::authenticated_transfer_elf(QList<uint8_t>& output) {
     FfiProgram ffi_program {};
     WalletFfiError error = wallet_ffi_transfer_elf(&ffi_program);
     if (error != SUCCESS) {
-        qWarning() << "authenticated_transfer_elf: wallet FFI error " << error;
-        return QList<uint8_t> {};
+        return QString("authenticated_transfer_elf: wallet FFI error %1").arg(error);
     }
 
-    QList<uint8_t> result(ffi_program.elf_data, ffi_program.elf_data + ffi_program.elf_size);
+    output = QList<uint8_t>(ffi_program.elf_data, ffi_program.elf_data + ffi_program.elf_size);
     wallet_ffi_free_ffi_program(&ffi_program);
-    return result;
+    return QString();
 }
 
 
diff --git a/src/logos_execution_zone_wallet_module.h b/src/logos_execution_zone_wallet_module.h
index a4dd138..31da572 100644
--- a/src/logos_execution_zone_wallet_module.h
+++ b/src/logos_execution_zone_wallet_module.h
@@ -118,7 +118,7 @@ public:
 
     Q_INVOKABLE QList<uint32_t> serialization_helper(const QList<uint8_t>& input_data) override;
 
-    Q_INVOKABLE QList<uint8_t> authenticated_transfer_elf() override;
+    Q_INVOKABLE QString authenticated_transfer_elf(QList<uint8_t>& output) override;
     Q_INVOKABLE QList<uint8_t> token_elf() override;
     Q_INVOKABLE QList<uint8_t> amm_elf() override;
     Q_INVOKABLE QList<uint8_t> ata_elf() override;