diff --git a/src/cryptonote_config.h b/src/cryptonote_config.h
index f516b24a..e9cf60db 100644
--- a/src/cryptonote_config.h
+++ b/src/cryptonote_config.h
@@ -7,6 +7,7 @@
 
 #define BLOCK_MAJOR_VERSION_1                           1
 #define BLOCK_MAJOR_VERSION_2                           2
+#define BLOCK_MAJOR_VERSION_3                           3
 
 #define COIN                                            ((uint64_t)100000000) // pow(10, 8)
 #define DEFAULT_FEE                                     ((uint64_t)1000000) // pow(10, 6)
diff --git a/src/cryptonote_core/cryptonote_basic.h b/src/cryptonote_core/cryptonote_basic.h
index d59e37b7..e7e47012 100644
--- a/src/cryptonote_core/cryptonote_basic.h
+++ b/src/cryptonote_core/cryptonote_basic.h
@@ -456,7 +456,7 @@ namespace cryptonote
 
     BEGIN_SERIALIZE()
       VARINT_FIELD(major_version)
-      if(major_version > BLOCK_MAJOR_VERSION_2) return false;
+      if(major_version > BLOCK_MAJOR_VERSION_3) return false;
       VARINT_FIELD(minor_version)
       if (BLOCK_MAJOR_VERSION_1 == major_version)
       {
@@ -479,7 +479,7 @@ namespace cryptonote
 
     BEGIN_SERIALIZE_OBJECT()
       FIELDS(*static_cast<block_header *>(this))
-      if (BLOCK_MAJOR_VERSION_2 <= major_version)
+      if (BLOCK_MAJOR_VERSION_3 <= major_version)
       {
         auto sbb = make_serializable_bytecoin_block(*this, false, false);
         FIELD_N("parent_block", sbb);
diff --git a/src/cryptonote_core/cryptonote_format_utils.cpp b/src/cryptonote_core/cryptonote_format_utils.cpp
index 7d8562b3..1dcedc92 100644
--- a/src/cryptonote_core/cryptonote_format_utils.cpp
+++ b/src/cryptonote_core/cryptonote_format_utils.cpp
@@ -650,7 +650,7 @@ namespace cryptonote
     if (!get_block_hashing_blob(b, blob))
       return false;
 
-    if (BLOCK_MAJOR_VERSION_2 <= b.major_version)
+    if (BLOCK_MAJOR_VERSION_3 <= b.major_version)
     {
       blobdata parent_blob;
       auto sbb = make_serializable_bytecoin_block(b, true, false);
@@ -860,7 +860,7 @@ namespace cryptonote
   //---------------------------------------------------------------
   bool check_proof_of_work_v2(const block& bl, difficulty_type current_diffic, crypto::hash& proof_of_work)
   {
-    if (BLOCK_MAJOR_VERSION_2 != bl.major_version)
+    if (BLOCK_MAJOR_VERSION_2 != bl.major_version || BLOCK_MAJOR_VERSION_3 != bl.major_version )
       return false;
 
     if (!get_bytecoin_block_longhash(bl, proof_of_work))
@@ -900,6 +900,7 @@ 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);
     }
 
     CHECK_AND_ASSERT_MES(false, false, "unknown block major version: " << bl.major_version << "." << bl.minor_version);
diff --git a/src/main.cc b/src/main.cc
index 99e97c9a..6adff0f0 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -163,7 +163,7 @@ Handle<Value> construct_block_blob(const Arguments& args) {
         return except("Failed to parse block");
 
     b.nonce = nonce;
-    if (b.major_version == BLOCK_MAJOR_VERSION_2) {
+    if (b.major_version == BLOCK_MAJOR_VERSION_2 || b.major_version == BLOCK_MAJOR_VERSION_3) {
         block parent_block;
         b.parent_block.nonce = nonce;
         if (!construct_parent_block(b, parent_block))