Introduction

This is a tentative of implementation of a basic blockchain using Python. The objective is to support an introduction of the elementary components and concepts of a blockchain to a beginner.

Source code explained

`Blockchain` class

The Blockchain is a chain of blocks. Each blocks is represented by several attributes include the list of transaction, a timestamp, a proof and the previous hash of the previous block.

Each block's hash will be generated based on the previous block's hash.

Variables:

chain: List of blocks
pending_transaction: List of transactions not yet added to a block

Methods

new_block: Method to add each block to the chain
new_transaction: Method to add a transaction to the list of pending transactions
hash: Method to generate a hash from a block
last_block: Method property to get the last block of the chain

Missing elements

There is no condition to use new_block to create a new block. We do not make use of the proof.
There is no fee for the miners.
What about: count of transactions, public/private keys, merkle tree structure.