hanneskimara / tinyblock

A from scratch implementation of a bitcoin node

TinyBlock

A from scratch implementation of a bitcoin node in python. It currently supports creating addresses, transactions and their serialization schemas.

Implemented Features

• Finite Fields (FieldElement, Point, Curve)
• Ellitic curve (Secp25kl, Keys, Signatures ...)
• Serialization ((Un)compressed SEC, DER, base58)
• Transactions (Inputs, Outputs, Script, Creation/serialization)
• Script (Parse, Serialization, Eval)
• Networking, Transaction Creation, Broadcast and Validation
• Block Creation, Sync and Validation
• Simple Payment Verification (Merkle Trees)
• Light Clients and Privacy (Bloom Filters)
• Segwit (p2wpkh ...)
• Next (SHA256, Payment Channels, Lightning ...)

Getting started

Code sample for generating a Private Key and address from a word secret. The sample prints the secp256kl curve points and an address

import hashlib, io

from tinyblock.secp256kl import PrivateKey


def hash256(s: str):
    return hashlib.sha256(hashlib.sha256(s).digest()).digest()

    
if __name__ == '__main__':
    e = int.from_bytes(hash256(b'my very secret secret'), 'big')
    z = int.from_bytes(hash256(b'my message'), 'big')

    prv = PrivateKey(e)
    print(f'Point: {prv.point}')
    addr = prv.point.address()

    print(f'Address: {addr}')

References

[1] Jimmy Song (2019), Programming Bitcoin