4 files changed, 32 insertions, 5 deletions
diff --git a/src/rpc/daemon_rpc_version.h b/src/rpc/daemon_rpc_version.h
index d178a82bc..2955d5449 100644
--- a/src/rpc/daemon_rpc_version.h
+++ b/src/rpc/daemon_rpc_version.h
@@ -35,7 +35,7 @@ namespace rpc
 {
 
 static const uint32_t DAEMON_RPC_VERSION_ZMQ_MINOR = 0;
-static const uint32_t DAEMON_RPC_VERSION_ZMQ_MAJOR = 1;
+static const uint32_t DAEMON_RPC_VERSION_ZMQ_MAJOR = 2;
 
 static const uint32_t DAEMON_RPC_VERSION_ZMQ = DAEMON_RPC_VERSION_ZMQ_MINOR + (DAEMON_RPC_VERSION_ZMQ_MAJOR << 16);
 
diff --git a/src/rpc/message.cpp b/src/rpc/message.cpp
index 3aefbd76e..f6c6b887d 100644
--- a/src/rpc/message.cpp
+++ b/src/rpc/message.cpp
@@ -65,8 +65,6 @@ const rapidjson::Value& get_method_field(const rapidjson::Value& src)
 void Message::toJson(rapidjson::Writer<epee::byte_stream>& dest) const
 {
   dest.StartObject();
-  INSERT_INTO_JSON_OBJECT(dest, status, status);
-  INSERT_INTO_JSON_OBJECT(dest, error_details, error_details);
   INSERT_INTO_JSON_OBJECT(dest, rpc_version, DAEMON_RPC_VERSION_ZMQ);
   doToJson(dest);
   dest.EndObject();
@@ -74,8 +72,6 @@ void Message::toJson(rapidjson::Writer<epee::byte_stream>& dest) const
 
 void Message::fromJson(const rapidjson::Value& val)
 {
-  GET_FROM_JSON_OBJECT(val, status, status);
-  GET_FROM_JSON_OBJECT(val, error_details, error_details);
   GET_FROM_JSON_OBJECT(val, rpc_version, rpc_version);
 }
 
diff --git a/src/serialization/json_object.cpp b/src/serialization/json_object.cpp
index 7cb9c2ed4..7c48cf6c3 100644
--- a/src/serialization/json_object.cpp
+++ b/src/serialization/json_object.cpp
@@ -148,6 +148,26 @@ void fromJsonValue(const rapidjson::Value& val, std::string& str)
   str = val.GetString();
 }
 
+void toJsonValue(rapidjson::Writer<epee::byte_stream>& dest, const std::vector<std::uint8_t>& src)
+{
+  const std::string hex = epee::to_hex::string(epee::to_span(src));
+  dest.String(hex.data(), hex.size());
+}
+
+void fromJsonValue(const rapidjson::Value& val, std::vector<std::uint8_t>& dest)
+{
+  if (!val.IsString())
+  {
+    throw WRONG_TYPE("string");
+  }
+
+  dest.resize(val.GetStringLength() / 2);
+  if ((val.GetStringLength() % 2) != 0 || !epee::from_hex::to_buffer(epee::to_mut_span(dest), {val.GetString(), val.GetStringLength()}))
+  {
+    throw BAD_INPUT();
+  }
+}
+
 void toJsonValue(rapidjson::Writer<epee::byte_stream>& dest, bool i)
 {
   dest.Bool(i);
diff --git a/src/serialization/json_object.h b/src/serialization/json_object.h
index b5d0f1508..de14c8911 100644
--- a/src/serialization/json_object.h
+++ b/src/serialization/json_object.h
@@ -154,6 +154,9 @@ inline void toJsonValue(rapidjson::Writer<epee::byte_stream>& dest, const std::s
 }
 void fromJsonValue(const rapidjson::Value& val, std::string& str);
 
+void toJsonValue(rapidjson::Writer<epee::byte_stream>& dest, const std::vector<std::uint8_t>&);
+void fromJsonValue(const rapidjson::Value& src, std::vector<std::uint8_t>& i);
+
 void toJsonValue(rapidjson::Writer<epee::byte_stream>& dest, bool i);
 void fromJsonValue(const rapidjson::Value& val, bool& b);
 
@@ -357,6 +360,10 @@ inline typename std::enable_if<sfinae::is_map_like<Map>::value, void>::type from
 template <typename Vec>
 inline typename std::enable_if<sfinae::is_vector_like<Vec>::value, void>::type toJsonValue(rapidjson::Writer<epee::byte_stream>& dest, const Vec &vec)
 {
+  using value_type = typename Vec::value_type;
+  static_assert(!std::is_same<value_type, char>::value, "encoding an array of chars is faster as hex");
+  static_assert(!std::is_same<value_type, unsigned char>::value, "encoding an array of unsigned char is faster as hex");
+
   dest.StartArray();
   for (const auto& t : vec)
     toJsonValue(dest, t);
@@ -379,6 +386,10 @@ namespace traits
 template <typename Vec>
 inline typename std::enable_if<sfinae::is_vector_like<Vec>::value, void>::type fromJsonValue(const rapidjson::Value& val, Vec& vec)
 {
+  using value_type = typename Vec::value_type;
+  static_assert(!std::is_same<value_type, char>::value, "encoding a vector of chars is faster as hex");
+  static_assert(!std::is_same<value_type, unsigned char>::value, "encoding a vector of unsigned char is faster as hex");
+
   if (!val.IsArray())
   {
     throw WRONG_TYPE("json array");