diff --git a/pybtc/blockchain.py b/pybtc/blockchain.py
index 48c49ad..1b65ef8 100644
--- a/pybtc/blockchain.py
+++ b/pybtc/blockchain.py
@@ -902,6 +902,7 @@ class BlockTemplate():
         nonce = s2rh(nonce)
         cbh = double_sha256(unhexlify(cb))
         merkle_root = merkleroot_from_branches(self.merkle_branches, cbh)
+        print("merkle_root ", hexlify(merkle_root))
         header = version + prev_hash + merkle_root + time + bits + nonce
         block = hexlify(header).decode()
         block += hexlify(to_var_int(len (self.transactions)+1)).decode()
diff --git a/pybtc/tools.py b/pybtc/tools.py
index 77a4f55..83b7cde 100644
--- a/pybtc/tools.py
+++ b/pybtc/tools.py
@@ -450,14 +450,21 @@ def is_valid_signature_encoding(sig):
 def bits2target(bits):
     if type(bits) == str:
         bits = unhexlify(bits)
-    return int.from_bytes(bits[1:], 'big') * (2 ** (8 * (bits[0] - 3)))
+    if type(bits) == bytes:
+        return int.from_bytes(bits[1:], 'big') * (2 ** (8 * (bits[0] - 3)))
+    else:
+        shift = bits >> 24
+        target = (bits & 0xffffff) * (1 << (8 * (shift - 3)))
+        return target
 
-def target2diff(target):
+def target2difficulty(target):
     return 0x00000000FFFF0000000000000000000000000000000000000000000000000000 / target
 
-def bits2diff(bits):
-    return target2diff(bits2target(bits))
+def bits2difficulty(bits):
+    return target2difficulty(bits2target(bits))
 
+def difficulty2target(difficulty):
+    return int(0x00000000FFFF0000000000000000000000000000000000000000000000000000 / difficulty)
 
 def rh2s(tthash):
     return hexlify(tthash[::-1]).decode()