2.3 添加工作量证明方法

def proof_of_work(self, last_proof):
proof = 0
# 工作量证明需要使用上一个区块的hash值，这里做一个简化版，拿上一个区块的工作量证明
while self.valid_proof(last_proof, proof) is False:
proof += 1
print("proof:%s" % proof)
return proof

def valid_proof(self, last_proof, proof):
guess = f'{last_proof}{proof}'.encode()
guess_hash = hashlib.sha256(guess).hexdigest()

print("guess_hash:%s" % guess_hash)
return guess_hash[0:4] == PROOF_DIFFICULTY
# 其中的print语句是为了观察测试使用，可以删掉