diff --git a/contrib/epee/include/misc_language.h b/contrib/epee/include/misc_language.h
index b70052c7..225b8c1e 100644
--- a/contrib/epee/include/misc_language.h
+++ b/contrib/epee/include/misc_language.h
@@ -389,22 +389,27 @@ namespace misc_utils
     auto res = container.insert(typename t_container_type::value_type(key, AUTO_VAL_INIT(typename t_container_type::mapped_type())));
     return res.first->second;
   } 
-}
-}
+} // namespace misc_utils
+} // namespace epee
 
 template<typename T>
 std::ostream& print_container_content(std::ostream& out, const T& v);
 
-template<typename T>
-std::ostream& operator<< (std::ostream& out, const std::vector<T>& v)
+namespace std
 {
-  return print_container_content(out, v);
-}
-template<typename T>
-std::ostream& operator<< (std::ostream& out, const std::list<T>& v)
-{
-  return print_container_content(out, v);
-}
+  template<typename T>
+  std::ostream& operator<< (std::ostream& out, const std::vector<T>& v)
+  {
+    return print_container_content(out, v);
+  }
+
+  template<typename T>
+  std::ostream& operator<< (std::ostream& out, const std::list<T>& v)
+  {
+    return print_container_content(out, v);
+  }
+
+} // namespace std
 
 template<typename T>
 std::ostream& print_container_content(std::ostream& out, const T& v)
diff --git a/src/common/crypto_stream_operators.cpp b/src/common/crypto_stream_operators.cpp
new file mode 100644
index 00000000..cc87dd37
--- /dev/null
+++ b/src/common/crypto_stream_operators.cpp
@@ -0,0 +1,18 @@
+// Copyright (c) 2018-2019 Zano Project
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#include "crypto_stream_operators.h"
+
+bool parse_hash256(const std::string str_hash, crypto::hash& hash)
+{
+  std::string buf;
+  bool res = epee::string_tools::parse_hexstr_to_binbuff(str_hash, buf);
+  if (!res || buf.size() != sizeof(crypto::hash))
+  {
+    std::cout << "invalid hash format: <" << str_hash << '>' << std::endl;
+    return false;
+  }
+
+  buf.copy(reinterpret_cast<char *>(&hash), sizeof(crypto::hash));
+  return true;
+}
diff --git a/src/common/crypto_stream_operators.h b/src/common/crypto_stream_operators.h
index 8ae7f53a..5aaf545c 100644
--- a/src/common/crypto_stream_operators.h
+++ b/src/common/crypto_stream_operators.h
@@ -8,29 +8,34 @@
 #include "include_base_utils.h"
 #include "crypto/crypto.h"
 #include "crypto/hash.h"
-//------
+
 bool parse_hash256(const std::string str_hash, crypto::hash& hash);
+
 template <class T>
-std::ostream &print256(std::ostream &o, const T &v) {
+std::ostream &print256(std::ostream &o, const T &v)
+{
   return o << "<" << epee::string_tools::pod_to_hex(v) << ">";
 }
 
 template <class T>
-std::ostream &print16(std::ostream &o, const T &v) {
+std::ostream &print16(std::ostream &o, const T &v)
+{
   return o << "<" << epee::string_tools::pod_to_hex(v).substr(0, 5) << "..>";
 }
 
 template <class T>
-std::string print16(const T &v) {
+std::string print16(const T &v)
+{
   return std::string("<") + epee::string_tools::pod_to_hex(v).substr(0, 5) + "..>";
 }
 
 
-namespace crypto {
-  inline std::ostream &operator <<(std::ostream &o, const crypto::public_key &v) { return print256(o, v); }
-  inline std::ostream &operator <<(std::ostream &o, const crypto::secret_key &v) { return print256(o, v); }
-  inline std::ostream &operator <<(std::ostream &o, const crypto::key_derivation &v) { return print256(o, v); }
-  inline std::ostream &operator <<(std::ostream &o, const crypto::key_image &v) { return print256(o, v); }
-  inline std::ostream &operator <<(std::ostream &o, const crypto::signature &v) { return print256(o, v); }
-  inline std::ostream &operator <<(std::ostream &o, const crypto::hash &v) { return print256(o, v); }
-}
\ No newline at end of file
+namespace crypto
+{
+  inline std::ostream &operator <<(std::ostream &o, const crypto::public_key &v)      { return print256(o, v); }
+  inline std::ostream &operator <<(std::ostream &o, const crypto::secret_key &v)      { return print256(o, v); }
+  inline std::ostream &operator <<(std::ostream &o, const crypto::key_derivation &v)  { return print256(o, v); }
+  inline std::ostream &operator <<(std::ostream &o, const crypto::key_image &v)       { return print256(o, v); }
+  inline std::ostream &operator <<(std::ostream &o, const crypto::signature &v)       { return print256(o, v); }
+  inline std::ostream &operator <<(std::ostream &o, const crypto::hash &v)            { return print256(o, v); }
+} // namespace crypto
diff --git a/src/currency_core/blockchain_storage.cpp b/src/currency_core/blockchain_storage.cpp
index 5e2569be..d2d40df8 100644
--- a/src/currency_core/blockchain_storage.cpp
+++ b/src/currency_core/blockchain_storage.cpp
@@ -2625,7 +2625,7 @@ bool blockchain_storage::find_blockchain_supplement(const std::list<crypto::hash
     blocks.back().first = m_db_blocks[i];
     std::list<crypto::hash> mis;
     get_transactions_direct(m_db_blocks[i]->bl.tx_hashes, blocks.back().second, mis);
-    CHECK_AND_ASSERT_MES(!mis.size(), false, "internal error, transaction from block " << get_block_hash(m_db_blocks[i]->bl) << "[" << i << "] not found" );
+    CHECK_AND_ASSERT_MES(!mis.size(), false, "internal error, block " << get_block_hash(m_db_blocks[i]->bl) << " [" << i << "] contains missing transactions: " << mis);
   }
   return true;
 }
diff --git a/src/currency_core/currency_format_utils.cpp b/src/currency_core/currency_format_utils.cpp
index 57b9a8d2..a2c019d3 100644
--- a/src/currency_core/currency_format_utils.cpp
+++ b/src/currency_core/currency_format_utils.cpp
@@ -2665,20 +2665,3 @@ namespace currency
   }
 
 } // namespace currency
-
-
-bool parse_hash256(const std::string str_hash, crypto::hash& hash)
-{
-  std::string buf;
-  bool res = epee::string_tools::parse_hexstr_to_binbuff(str_hash, buf);
-  if (!res || buf.size() != sizeof(crypto::hash))
-  {
-    std::cout << "invalid hash format: <" << str_hash << '>' << std::endl;
-    return false;
-  }
-  else
-  {
-    buf.copy(reinterpret_cast<char *>(&hash), sizeof(crypto::hash));
-    return true;
-  }
-}