diff --git a/src/Any/Signer.cpp b/src/Any/Signer.cpp
index 80a8677acbf..b3c3a256e11 100644
--- a/src/Any/Signer.cpp
+++ b/src/Any/Signer.cpp
@@ -33,31 +33,31 @@ Proto::SigningOutput Signer::sign() const noexcept {
         case TWCoinTypeCosmos: {
             Cosmos::Proto::SigningInput message;
             parse(transaction, &message, output);
-            if (!output.has_error()) {
+            if (output.success()) {
                 message.set_private_key(privateKey.bytes.data(), privateKey.bytes.size());
                 auto signerOutput = Cosmos::Signer(std::move(message)).build();
-                output.set_json(signerOutput.json());
+                output.set_output(signerOutput.json());
             }
             break;
         }
         case TWCoinTypeBinance: {
             Binance::Proto::SigningInput message;
             parse(transaction, &message, output);
-            if (!output.has_error()) {
+            if (output.success()) {
                 message.set_private_key(privateKey.bytes.data(), privateKey.bytes.size());
                 auto signerOutput = Binance::Signer(std::move(message)).build();
-                output.set_encoded(hex(signerOutput.begin(), signerOutput.end()));
+                output.set_output(hex(signerOutput.begin(), signerOutput.end()));
             }
             break;
         }
         case TWCoinTypeEthereum: {
             Ethereum::Proto::SigningInput message;
             parse(transaction, &message, output);
-            if (!output.has_error()) {
+            if (output.success()) {
                 message.set_private_key(privateKey.bytes.data(), privateKey.bytes.size());
                 auto signerOutput = Ethereum::Signer(load(message.chain_id())).sign(message);
                 auto encoded = signerOutput.encoded();
-                output.set_encoded(hex(encoded.begin(), encoded.end()));
+                output.set_output(hex(encoded.begin(), encoded.end()));
             }
             break;
         }
@@ -79,10 +79,13 @@ void Signer::parse(const std::string& transaction, Message* message,
 
     auto result = JsonStringToMessage(transaction, message, options);
 
-    if (!result.ok()) {
-        auto error = new Proto::SigningOutput_Error();
-        error->set_code(SignerErrorCodeInvalidJson);
-        error->set_description(result.error_message());
-        output.set_allocated_error(error);
+    if (result.ok()) {
+        output.set_success(true);
+        return;
     }
+
+    auto error = new Proto::SigningOutput_Error();
+    error->set_code(SignerErrorCodeInvalidJson);
+    error->set_description(result.error_message());
+    output.set_allocated_error(error);
 }
diff --git a/src/proto/Any.proto b/src/proto/Any.proto
index 855f0a9c8f7..a4503025b0d 100644
--- a/src/proto/Any.proto
+++ b/src/proto/Any.proto
@@ -20,12 +20,10 @@ message SigningOutput {
         string description = 2;
     }
 
-    oneof output {
-        // Signing error
-        Error  error  = 1;
-        // Signing output as JSON
-        string json   = 2;
-        // Signing output encoded
-        string encoded = 3;
+    oneof result {
+        Error error = 1;
+        bool success = 2;
     }
+
+    string output = 4;
 }
\ No newline at end of file
diff --git a/tests/Any/SignerTests.cpp b/tests/Any/SignerTests.cpp
index 6daa495e60a..7c7c6aacdca 100644
--- a/tests/Any/SignerTests.cpp
+++ b/tests/Any/SignerTests.cpp
@@ -24,10 +24,9 @@ TEST(Signer, CosmosTransactionSign) {
     auto signer = Signer(input);
     auto output = signer.sign();
 
-    ASSERT_FALSE(output.has_error());
-    ASSERT_EQ("", output.encoded());
+    ASSERT_TRUE(output.success());
     ASSERT_EQ("{\"mode\":\"block\",\"tx\":{\"fee\":{\"amount\":[{\"amount\":\"5000\",\"denom\":\"uatom\"}],\"gas\":\"200000\"},\"memo\":\"Testing\",\"msg\":[{\"type\":\"cosmos-sdk/MsgSend\",\"value\":{\"amount\":[{\"amount\":\"995000\",\"denom\":\"uatom\"}],\"from_address\":\"cosmos1ufwv9ymhqaal6xz47n0jhzm2wf4empfqvjy575\",\"to_address\":\"cosmos135qla4294zxarqhhgxsx0sw56yssa3z0f78pm0\"}}],\"signatures\":[{\"pub_key\":{\"type\":\"tendermint/PubKeySecp256k1\",\"value\":\"A6EsukEXB53GhohQVeDpxtkeH8KQIayd/Co/ApYRYkTm\"},\"signature\":\"ULEpUqNzoAnYEx2x22F3ANAiPXquAU9+mqLWoAA/ZOUGTMsdb6vryzsW6AKX2Kqj1pGNdrTcQ58Z09JPyjpgEA==\"}],\"type\":\"cosmos-sdk/MsgSend\"}}",
-            output.json());
+            output.output());
 }
 
 TEST(Signer, BinanceTransactionSign) {
@@ -40,10 +39,9 @@ TEST(Signer, BinanceTransactionSign) {
     auto signer = Signer(input);
     auto output = signer.sign();
 
-    ASSERT_FALSE(output.has_error());
-    ASSERT_EQ("", output.json());
+    ASSERT_TRUE(output.success());
     ASSERT_EQ("ca01f0625dee0a4a2a2c87fa0a210a1412e654edef9e508b833736a987d069da5a89aedb12090a03424e4210cb8d5212210a1433bbf307b98146f13d20693cf946c2d77a4caf2812090a03424e4210cb8d52126d0a26eb5ae9872102e58176f271a9796b4288908be85094a2ac978e25535fd59a37b58626e3a84d9e1240015b4beb3d6ef366a7a92fd283f66b8f0d8cdb6b152a9189146b27f84f507f047e248517cf691a36ebc2b7f3b7f64e27585ce1c40f1928d119c31af428efcf3e1882671a0754657374696e672002",
-            output.encoded());
+            output.output());
 }
 
 TEST(Signer, EthereumTransactionSign) {
@@ -56,10 +54,9 @@ TEST(Signer, EthereumTransactionSign) {
     auto signer = Signer(input);
     auto output = signer.sign();
 
-    ASSERT_FALSE(output.has_error());
-    ASSERT_EQ("", output.json());
+    ASSERT_TRUE(output.success());;
     ASSERT_EQ("f86a8084d693a400825208947d8bf18c7ce84b3e175b339c4ca93aed1dd166f1870348bca5a160008025a0fe5802b49e04c6b1705088310e133605ed8b549811a18968ad409ea02ad79f21a05bf845646fb1e1b9365f63a7fd5eb5e984094e3ed35c3bed7361aebbcbf41f10",
-              output.encoded());
+              output.output());
 }
 
 TEST(Signer, NetworkNotSupported) {
@@ -72,7 +69,7 @@ TEST(Signer, NetworkNotSupported) {
     auto signer = Signer(input);
     auto output = signer.sign();
 
-    ASSERT_TRUE(output.has_error());
+    ASSERT_FALSE(output.success());
     ASSERT_EQ(SignerErrorCodeNotSupported, output.error().code());
     ASSERT_EQ("Network not supported", output.error().description());
 }
@@ -87,6 +84,6 @@ TEST(Signer, InvalidJsonFormat) {
     auto signer = Signer(input);
     auto output = signer.sign();
 
-    ASSERT_TRUE(output.has_error());
+    ASSERT_FALSE(output.success());
     ASSERT_EQ(SignerErrorCodeInvalidJson, output.error().code());
 }