diff --git a/src/cryptonote_config.h b/src/cryptonote_config.h
index d758028..e9cf60d 100644
--- a/src/cryptonote_config.h
+++ b/src/cryptonote_config.h
@@ -1,12 +1,12 @@
 #pragma once
 
 #define CRYPTONOTE_PUBLIC_ADDRESS_TEXTBLOB_VER          0
-#define CURRENT_TRANSACTION_VERSION                     2
+#define CURRENT_TRANSACTION_VERSION                     1
 #define CURRENT_BLOCK_MAJOR_VERSION                     1
 #define CURRENT_BLOCK_MINOR_VERSION                     0
 
 #define BLOCK_MAJOR_VERSION_1                           1
-#define BLOCK_MAJOR_VERSION_2                           3
+#define BLOCK_MAJOR_VERSION_2                           2
 #define BLOCK_MAJOR_VERSION_3                           3
 
 #define COIN                                            ((uint64_t)100000000) // pow(10, 8)
diff --git a/src/cryptonote_core/cryptonote_basic.h b/src/cryptonote_core/cryptonote_basic.h
index 1e58a9b..dfce942 100644
--- a/src/cryptonote_core/cryptonote_basic.h
+++ b/src/cryptonote_core/cryptonote_basic.h
@@ -174,7 +174,10 @@ namespace cryptonote
 
     BEGIN_SERIALIZE()
       VARINT_FIELD(version)
-      if(CURRENT_TRANSACTION_VERSION < version) return false;
+      if(CURRENT_TRANSACTION_VERSION < version) {
+        puts("!!! Too high tx version for serialization");
+        return false;
+      }
       VARINT_FIELD(unlock_time)
       FIELD(vin)
       FIELD(vout)
@@ -408,7 +411,10 @@ namespace cryptonote
 
     BEGIN_SERIALIZE_OBJECT()
       VARINT_FIELD_N("major_version", b.major_version);
-      if(b.major_version > CURRENT_BYTECOIN_BLOCK_MAJOR_VERSION) return false;
+      if(b.major_version > CURRENT_BYTECOIN_BLOCK_MAJOR_VERSION) {
+        puts("!!! Too high bytecoin version to serialize it");
+        return false;
+      }
       VARINT_FIELD_N("minor_version", b.minor_version);
       VARINT_FIELD(timestamp);
       FIELD_N("prev_id", b.prev_id);
diff --git a/src/cryptonote_core/cryptonote_format_utils.cpp b/src/cryptonote_core/cryptonote_format_utils.cpp
index 649a387..4a1736a 100644
--- a/src/cryptonote_core/cryptonote_format_utils.cpp
+++ b/src/cryptonote_core/cryptonote_format_utils.cpp
@@ -956,7 +956,7 @@ namespace cryptonote
     {
     case BLOCK_MAJOR_VERSION_1: return check_proof_of_work_v1(bl, current_diffic, proof_of_work);
     case BLOCK_MAJOR_VERSION_2: return check_proof_of_work_v2(bl, current_diffic, proof_of_work);
-    //case BLOCK_MAJOR_VERSION_3: return check_proof_of_work_v2(bl, current_diffic, proof_of_work);
+    case BLOCK_MAJOR_VERSION_3: return check_proof_of_work_v2(bl, current_diffic, proof_of_work);
     }
 
     CHECK_AND_ASSERT_MES(false, false, "unknown block major version: " << bl.major_version << "." << bl.minor_version);