def mine(self):
unmined_raw = self.unmined_raw()
assert 0 < self.difficulty < 256
target = ((1 << 256 - self.difficulty) - 1).to_bytes(32, 'big')
self.padding = 0
while double_sha(unmined_raw) > target:
self.padding += 1
unmined_raw = unmined_raw[:-4] + self.padding.to_bytes(4, 'big')
self.__checksum = double_sha(self.unmined_raw())
def test_4_wrong_previous_block(self):
self.blocks[0].previous_block_rev = BlockRev.from_id(double_sha(b'something'))
self.blocks[0].mine()
sign_object(self.public_key, self.private_key, self.blocks[0])
with self.assertRaisesRegex(Block.ChainError, "previous_block_rev does not exist"):
self.blocks[0].verify()
def id(self):
if self.requires_signature_verification or self.__id is None:
self.__id = double_sha(self.raw())
return self.__id
def test_wrong_checksum(self):
self.block._Block__checksum = double_sha(b'something')
with self.assertRaisesRegex(Block.VerifyError, "wrong checksum"):
self.block.unsigned_raw()
def is_checksum_correct(self):
"""
Check if checksum is correct.
"""
return self.__checksum == double_sha(self.unmined_raw())