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wolfcoin.py
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wolfcoin.py
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"""
Origin Code Base: Gerald Nash
Modifier: Yu Zhou
Algorithm Used.
Mini Blockchain using SHA-256: [Secure Hashing Algorithm 256]
Giving SHA-256 a hash key, it would generated a non-sense value that represents
the key.
Algorithm Explained.
How does SHA works?
Feeding in a 512 bits binary at a time, randomize in SHA's internal receptors, repeat the process
for 80+ times, generate a temporary result and then receive another 512 bits binary to repeat the process
again. Until there is no more data feeds in, then output the final results.
More on here: https://www.youtube.com/watch?v=DMtFhACPnTY
"""
import hashlib as hasher
import datetime as date
class Block:
def __init__(self, index, timestamp, data, previous_hash):
self.index = index
self.timestamp = timestamp
self.data = data
self.previous_hash = previous_hash
self.hash = self.hash_block()
def hash_block(self):
"""
Function Explain.
hash.update(arg) :Update the hash object with the string arg.
hash.hexdigest(arg) : Return the digest of the strings passed to the
update() method so far containing only hexadecimal digits.
"""
sha = hasher.sha256()
sha.update(str(self.index) +
str(self.timestamp) +
str(self.data) +
str(self.previous_hash))
return sha.hexdigest()
def create_genesis_block():
"""
Manually create the first block with
index zero and arbitary previous hash
"""
return Block(0, date.datetime.now(), "Genesis Block", "0")
def new_block(last_block):
"""
Create new block based on previous block
"""
this_index = last_block.index + 1
this_timestamp = date.datetime.now()
this_data = "Yo! I am block " + str(this_index)
this_hash = last_block.hash
return Block(this_index, this_timestamp, this_data, this_hash)
# Create the genesis within Blockchain
blockchain = [create_genesis_block()]
previous_block = blockchain[0]
# Upper Bound of blocks
blocks_num = 20
# Loop and create 20 subsequent blocks
for i in xrange(0, blocks_num):
next_block = new_block(previous_block)
blockchain.append(next_block)
previous_block = next_block
print "Block #{} has been added to the blockchain!".format(next_block.index)
print "Hash: {}\n".format(next_block.hash)