Blockchain in Python

This module creates a blockchain using Flask, allowing you to interact with it via HTTP requests.

• Creating a new block — /mine runs the proof-of-work algorithm and creates a new block
• Creating a new transaction — /transactions/new adds new transactions to the blockchain
• Getting the full chain — /chain returns the current chain of blocks and its length
• Registering new nodes — /nodes/register adds new nodes to the network
• Consensus algorithm — /nodes/resolve checks and resolves conflicts in the chain

This module implements the basic structure of a blockchain with the Block and Blockchain classes.

• Creating a genesis block — create_genesis_block creates the first block in the chain
• Adding a new block — add_block adds a new block to the chain, setting the correct hash of the previous block

Installation:

pip install -r requirements.txt

Run Flask API:

python blockchain.py

Run Simple Blockchain:

python blockchain_base.py

Mine a new block:

curl http://localhost:5000/mine

Response:

{
  "index": 2,
  "message": "New Block Forged",
  "previous_hash": "5d9d222c768d6c501ae28670a7333e0ae39c14d7884650bf12cf32d3961e2682",
  "proof": 35293,
  "transactions": [
    {
      "amount": 1,
      "recipient": "902a4bd96aa44abcb0d9a097bd78c462",
      "sender": "0"
    }
  ]
}

Get full chain:

curl http://localhost:5000/chain

Create a new transaction:

curl -X POST -H "Content-Type: application/json" -d '{
    "sender": "d4ee26eee15148ee92c6cd394edd974e",
    "recipient": "someone-other-address",
    "amount": 5
}' "http://localhost:5000/transactions/new"

Response:

{
  "message": "Transaction will be added to Block 4"
}

Index: 0
Timestamp: 2024-10-30 00:01:20.180414
Data: Genesis Block
Previous Hash: 0
Hash: 02a478085aca11b94a6ea0b5c2cfe9df56dffbe5153df269f3609faa19fc5641

Index: 1
Timestamp: 2024-10-30 00:01:20.180433
Data: Transaction Data
Previous Hash: 02a478085aca11b94a6ea0b5c2cfe9df56dffbe5153df269f3609faa19fc5641
Hash: 3a7bc11cc8e213468fc25b6708b39e41780d5673ffffb995bbfdaa909d37b73e

Index: 2
Timestamp: 2024-10-30 00:01:20.180441
Data: Another Transaction
Previous Hash: 3a7bc11cc8e213468fc25b6708b39e41780d5673ffffb995bbfdaa909d37b73e
Hash: 477333623f8b9819e23412dfda01aee127d63a2744b32515cc2d0678fcf7fac1

By using this software, you agree to the full disclaimer terms.

Software provided "AS IS" without warranty. You assume all risks.

Full legal disclaimer: See DISCLAIMER.md

License: BSD 3-Clause License