1import io
2
3from pycoin.block import Block as BaseBlock
4
5from .hash import groestlHash
6from .Tx import Tx
7
8
9class Block(BaseBlock):
10    Tx = Tx
11
12    def _calculate_hash(self):
13        s = io.BytesIO()
14        self.stream_header(s)
15        return groestlHash(s.getvalue())
16