In this project, I implemented a toy cryptocurrency blockchain from scratch. Here are some details:

• IP addresses of miner nodes are defined in miners.txt file.
• Public keys(Addresses) of miners are defined in genesis block payload.
• Blocks and transactions are signed with RSA public key digital signature scheme.
• Account based transaction format is used.
• REST API is used to interact with the nodes.

• Python
  • RSA
  • Django
  • Django Rest Framework

• Put */10 * * * * cd <project path> && /usr/bin/python manage.py mine
• python manage.py init
• python manage.py runserver 0.0.0.0:8000

• Method : GET

• Path : /block_count/

• Response :

{
    "block_count": <block_count>
}

• Method : GET

• Path : /blocks/<block_hash>/

• Response :

{
  "index": 1,
  "timestamp": <timestamp>,
  "sign": <sign>,
  "hash": <hash>,
  "previous_hash": <previous_hash>,
  "transactions": [<transaction_data>, <transaction_data>, ...],
  "payload": <payload>,
  "miner": <miner>
}

• Method : GET

• Path : /transactions/<transaction_hash>/

• Response :

{
  "sender": <sender>,
  "receiver": <receiver>,
  "amount": <amount>,
  "hash": <hash>,
  "timestamp": <timestamp>,
  "sign": <sign>
}

• Method : POST

• Path : /new_transaction/

• Request :

{
  "sender": <sender>,
  "receiver": <receiver>,
  "amount": <amount>,
  "hash": <hash>,
  "timestamp": <timestamp>,
  "sign": <sign>
}

• Create new public address and key pairs : python wallet.py create_new_wallet

• Send coin : python wallet.py <public_key_of_receiver> <amount>