diff --git a/src/server/shared/Bitcoin/Block.cpp b/src/server/shared/Bitcoin/Block.cpp
index 770c1eb..cb23710 100644
--- a/src/server/shared/Bitcoin/Block.cpp
+++ b/src/server/shared/Bitcoin/Block.cpp
@@ -16,7 +16,7 @@ namespace Bitcoin
             for (uint32 i = 0; i < size; i += 2)
             {
                 uint32 i2 = std::min(i+1, size-1);
-                merkleTree.push_back(Crypto::GOSTD(merkleTree[j+i], merkleTree[j+i2]));
+                merkleTree.push_back(Crypto::GOSTD(Util::Join(merkleTree[j+i], merkleTree[j+i2])));
             }
             
             j += size;
@@ -35,7 +35,7 @@ namespace Bitcoin
         uint32 j = 0;
         for (uint32 size = tx.size(); size > 1; size = (size+1)/2)
         {
-            merkleTree[j+size] = Crypto::GOSTD(merkleTree[j], merkleTree[j+1]);
+            merkleTree[j+size] = Crypto::GOSTD(Util::Join(merkleTree[j], merkleTree[j+1]));
             j += size;
         }
         
@@ -52,6 +52,6 @@ namespace Bitcoin
         buf << time;
         buf << bits;
         buf << nonce;
-        return Crypto::GOSTD(buf.Binary());
+        return Crypto::GOSTDBlock(buf.Binary());
     }
 }
diff --git a/src/server/shared/Crypto.cpp b/src/server/shared/Crypto.cpp
index 20e1189..615d320 100644
--- a/src/server/shared/Crypto.cpp
+++ b/src/server/shared/Crypto.cpp
@@ -4,6 +4,16 @@
 namespace Crypto
 {
 	BinaryData GOSTD(BinaryData data)
+	{
+		uint8_t hash1[64];
+		std::vector<byte> hash(32);
+		i2p::crypto::GOSTR3411_2012_512 (&data[0], data.size (), hash1);	
+		i2p::crypto::GOSTR3411_2012_256 (hash1, 64, &hash[0]);
+		// we don't convert to Little Endian here
+		return 	hash;
+	}
+
+	BinaryData GOSTDBlock(BinaryData data)
 	{
 		uint8_t hash1[64], hash2[32];
 		i2p::crypto::GOSTR3411_2012_512 (&data[0], data.size (), hash1);	
@@ -14,16 +24,4 @@ namespace Crypto
 			hash.push_back (hash2[31-i]); 
 		return 	hash;
 	}
-
-	BinaryData GOSTD(BinaryData data1, BinaryData data2)
-	{
-		BinaryData data3 = data1;
-    	data3.insert(data3.end(), data2.begin(), data2.end());
-		uint8_t hash1[64];
-		std::vector<byte> hash(32);
-		i2p::crypto::GOSTR3411_2012_512 (&data3[0], data3.size (), hash1);	
-		i2p::crypto::GOSTR3411_2012_256 (hash1, 64, &hash[0]);
-		// we don't convert to Little Endian here
-		return 	hash;
-	}
 }
diff --git a/src/server/shared/Crypto.h b/src/server/shared/Crypto.h
index 5f85936..3f65341 100644
--- a/src/server/shared/Crypto.h
+++ b/src/server/shared/Crypto.h
@@ -9,8 +9,8 @@
 
 namespace Crypto
 {
-	BinaryData GOSTD(BinaryData data);
-	BinaryData GOSTD(BinaryData data1, BinaryData data2); // for merkle
+	BinaryData GOSTD(BinaryData data); // for Merkle
+	BinaryData GOSTDBlock (BinaryData data); // for 80 bytes header	
  }
 
 #endif