Remove header_hashes

lib/coins.py

@@ -224,11 +224,6 @@ class Coin(object):
         '''Given a header return previous hash'''
         return header[4:36]
 
-    @classmethod
-    def header_hashes(cls, header):
-        '''Given a header return the previous and current block hashes.'''
-        return header[4:36], double_sha256(header)
-
     @classmethod
     def read_block(cls, block):
         '''Return a tuple (header, tx_hashes, txs) given a raw block.'''
@@ -383,12 +378,6 @@ class Dash(Coin):
         import x11_hash
         return x11_hash.getPoWHash(header)
 
-    @classmethod
-    def header_hashes(cls, header):
-        '''Given a header return the previous and current block hashes.'''
-        import x11_hash
-        return header[4:36], x11_hash.getPoWHash(header)
-
 class DashTestnet(Dash):
     NAME = "Dash"
     SHORTNAME = "tDASH"