To learn the basics of how a blockchain work use the Python code below to create a very basic blockchain in Python.
Import hashlib which is a common interface to many different secure hash and message digest algorithms in Python. For more information about hashlib read here.
First create a blockchain class and name for file Block.py. This class is responsible for joining the current transaction information and then hashing this information with the previous blocks hash.
Then create a new file called blockchain which imports the Block.py contents. Each block has contents that gets hashed with the previous blocks hash.
The simple blockchain creates a genesis block (first block), and then second block and so on. This is a great way to step through the orders of operation of a blockchain and see how the previous block impacts the current block.
Name this file Block.py
import hashlib class block: def __init__(self, previous_hash, transactions): self.transactions = transactions self.previous_hash = previous_hash string_to_hash = ''.join(transactions) + previous_hash self.block_hash = hashlib.sha256(string_to_hash.encode()).hexdigest()
name this file blockchain.py
from Block import block blockchain =  genesis_block = block('this is the first block',['sean sent', 'bryan sent', 'Steve sent']) second_block = block(genesis_block.block_hash, ['mary sent', 'keira sent']) third_block = block(genesis_block.block_hash, ['bryan sent', 'fran sent']) print(genesis_block.block_hash) print(second_block.block_hash) print(third_block.block_hash)