def __proof_of_work(self, dictionary):
"""
Increment a property 'nonce' until the resulting hash has a leading amount of zeros equal to Blockchain.__difficulty
"""
hashed = Block.sha(dictionary)
while hashed[:self.__difficulty[0]] != '0' * self.__difficulty[0]:
dictionary['nonce'] += 1
hashed = Block.sha(dictionary)
return dictionary
def __validate_gen(self, properties, set_hash):
if all(x == 0 for x in [
properties['index'], properties['prev_hash'],
properties['origin'], properties['destination']
]):
if properties['data'] == 'Genesis':
props_c = copy.deepcopy(properties)
hashed = Block.sha(props_c)
if all(j == hashed for j in [properties['hash'], set_hash[7]]):
if hashed[:self.
__difficulty[0]] == '0' * self.__difficulty[0]:
return True
return False
def __hash_check(self, props, iprops, prev_iprops):
"""
Incorrect Blocks are initialized as empty dicts, check lengths to detect that
Check property:'prev_hash' equals property:'hash' of previous Block
Verify hash of all properties equals the property:'hash' value
Check resulting hash has a leading amount of zeros equal to Blockchain.__difficulty (check if proof of work was used)
"""
if len(iprops) == len(prev_iprops):
if iprops[3] == prev_iprops[7]:
props_c = copy.deepcopy(props)
hashed = Block.sha(props_c)
if all(x == hashed for x in [props['hash'], iprops[7]]):
if hashed[:self.
__difficulty[0]] == '0' * self.__difficulty[0]:
return True
return False