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A blockchain is a digital ledger where data is stored in blocks. Each block is linked to the previous one, forming a chain. This chain is maintained by a network of computers and is secured using cryptography to ensure the data is safe and unchangeable.
# Simple illustration of a blockchain
class Block:
def __init__(self, index, previous_hash, data, hash):
self.index = index
self.previous_hash = previous_hash
self.data = data
self.hash = hash
# Creating a new block
block1 = Block(1, '0', 'Initial Block', 'abcd1234')
print(f'Block Index: {block1.index}')
print(f'Previous Hash: {block1.previous_hash}')
print(f'Block Data: {block1.data}')
print(f'Block Hash: {block1.hash}')
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