diff --git a/src/crypto/zarcanum.h b/src/crypto/zarcanum.h
index 3fe4b5c1..55e6b202 100644
--- a/src/crypto/zarcanum.h
+++ b/src/crypto/zarcanum.h
@@ -123,6 +123,15 @@ namespace crypto
     return generate_schnorr_sig(m, point_t(A), scalar_t(secret_a), result);
   }
 
+  inline bool generate_schnorr_sig(const hash& m, const secret_key& secret_a, generic_schnorr_sig& result)
+  {
+    scalar_t secret_a_s(secret_a);
+    if (!secret_a_s.is_reduced())
+      return false;
+    point_t A = secret_a_s * c_point_G;
+    return generate_schnorr_sig_custom_generator(m, A, secret_a_s, result, c_point_G);
+  }
+
 
   template<generator_tag gen = gt_G>
   inline bool verify_schnorr_sig(const hash& m, const public_key& A, const generic_schnorr_sig& sig) noexcept;
diff --git a/src/currency_core/currency_basic.h b/src/currency_core/currency_basic.h
index 9e25b396..0b68379b 100644
--- a/src/currency_core/currency_basic.h
+++ b/src/currency_core/currency_basic.h
@@ -843,7 +843,7 @@ namespace currency
 
   struct asset_operation_ownership_proof_eth
   {
-    crypto::eth_signature eth_sig;
+    crypto::eth_signature eth_sig;            // 64 bytes
     uint8_t version = 0;
 
     BEGIN_VERSIONED_SERIALIZE(0, version)
diff --git a/src/currency_core/currency_format_utils.h b/src/currency_core/currency_format_utils.h
index 0aa22de2..c654aee6 100644
--- a/src/currency_core/currency_format_utils.h
+++ b/src/currency_core/currency_format_utils.h
@@ -950,6 +950,12 @@ namespace currency
     }
   }
   //---------------------------------------------------------------
+  template<typename invocable_t>
+  typename std::enable_if_t<std::is_invocable_v<invocable_t, std::ostream&>, std::ostream&> operator<<(std::ostream& o, invocable_t callee)
+  {
+    callee(o);
+    return o;
+  }
   //---------------------------------------------------------------
   std::ostream& operator <<(std::ostream& o, const ref_by_id& r);
   std::ostream& operator <<(std::ostream& o, const std::type_info& ti);
diff --git a/src/rpc/core_rpc_server.cpp b/src/rpc/core_rpc_server.cpp
index ee76e1ac..cc81a19e 100644
--- a/src/rpc/core_rpc_server.cpp
+++ b/src/rpc/core_rpc_server.cpp
@@ -75,7 +75,8 @@ namespace currency
     return true;
   }
 #define check_core_ready() check_core_ready_(LOCAL_FUNCTION_DEF__)
-#define CHECK_CORE_READY() if(!check_core_ready()){res.status =  API_RETURN_CODE_BUSY;return true;}
+#define CHECK_CORE_READY()    if (!check_core_ready()) {res.status =  API_RETURN_CODE_BUSY; return true; }
+#define CHECK_CORE_READY_WE() if (!check_core_ready()) {error_resp.code = CORE_RPC_ERROR_CODE_CORE_BUSY; error_resp.message = "Core is busy."; return false; }
   //------------------------------------------------------------------------------------------------------------------------------
   bool core_rpc_server::on_get_height(const COMMAND_RPC_GET_HEIGHT::request& req, COMMAND_RPC_GET_HEIGHT::response& res, connection_context& cntx)
   {
@@ -1001,7 +1002,7 @@ namespace currency
   //------------------------------------------------------------------------------------------------------------------------------
   bool core_rpc_server::on_submitblock(const COMMAND_RPC_SUBMITBLOCK::request& req, COMMAND_RPC_SUBMITBLOCK::response& res, epee::json_rpc::error& error_resp, connection_context& cntx)
   {
-    CHECK_CORE_READY();
+    CHECK_CORE_READY_WE();
     if(req.size()!=1)
     {
       error_resp.code = CORE_RPC_ERROR_CODE_WRONG_PARAM;
@@ -1044,8 +1045,7 @@ namespace currency
   //------------------------------------------------------------------------------------------------------------------------------
   bool core_rpc_server::on_submitblock2(const COMMAND_RPC_SUBMITBLOCK2::request& req, COMMAND_RPC_SUBMITBLOCK2::response& res, epee::json_rpc::error& error_resp, connection_context& cntx)
   {
-    CHECK_CORE_READY();
-
+    CHECK_CORE_READY_WE();
 
     block b = AUTO_VAL_INIT(b);
     if (!parse_and_validate_block_from_blob(req.b, b))
diff --git a/src/serialization/serialization.h b/src/serialization/serialization.h
index bb61001e..02eee4b1 100644
--- a/src/serialization/serialization.h
+++ b/src/serialization/serialization.h
@@ -238,8 +238,7 @@ bool t_unserializable_object_from_blob(t_object& to, const std::string& blob)
   ss << blob;
   binary_archive<false> ba(ss);
   bool r = ::serialization::serialize(ba, to);
-  CHECK_AND_ASSERT_MES(r, false, "Failed to parse block from blob");
-  return true;
+  return r;
 }
 //---------------------------------------------------------------
 template<class t_object>