diff --git a/src/cryptonote_config.h b/src/cryptonote_config.h
index 31cb032..3895d32 100644
--- a/src/cryptonote_config.h
+++ b/src/cryptonote_config.h
@@ -6,7 +6,8 @@
 #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)
 #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 20d333d..814e32e 100644
--- a/src/cryptonote_core/cryptonote_basic.h
+++ b/src/cryptonote_core/cryptonote_basic.h
@@ -470,6 +470,15 @@ namespace cryptonote
 
   // Implemented below
   inline serializable_bytecoin_block make_serializable_bytecoin_block(const block& b, bool hashing_serialization, bool header_only);
+struct RootBlock {
+  uint8_t majorVersion;
+  uint8_t minorVersion;
+  crypto::hash previousBlockHash;
+  uint16_t transactionCount;
+  std::vector<crypto::hash> baseTransactionBranch;
+  transaction baseTransaction;
+  std::vector<crypto::hash> blockchainBranch;
+};
 
   struct block_header
   {
@@ -478,7 +487,6 @@ namespace cryptonote
     uint64_t timestamp;
     crypto::hash prev_id;
     uint32_t nonce;
-
     BEGIN_SERIALIZE()
       VARINT_FIELD(major_version)
       VARINT_FIELD(minor_version)
@@ -491,7 +499,7 @@ namespace cryptonote
   struct block: public block_header
   {
     bytecoin_block parent_block;
-
+    RootBlock rootBlock;
     transaction miner_tx;
     std::vector<crypto::hash> tx_hashes;