HaskellCoin

Yet another blockchain but written in Haskell this time.

Print help to get the list of commands. In alpha version you can commit transaction from any address to any address without limitations on amount. Just enter commit with user hashes and amount and enter build to create new block in the network. Print show to list all blocks and transactions in the network.

Usage

To generate the private key (in case if you do not have one) simply answer Yes and the program will do everything by itself. For your convenience, the key was encoded in Base64. Then, get your id by entering:

command> id

If you have saved the private key from your previous session, and at least one machine was up all time you were offline or you saved the blockchain by entering

command> writeFile /path/to/file

If you want to load the blockchain from file, run:

command> loadFile /path/to/file

Then you share your id with your friends. At first, you will not have any coins binded with your account, to get some, run

command> build

This way, you will generate an empty block which will propagate over the net. Speaking of the Net, if you managed to find somebody brave enough to run this project, connect to them by

command> connect FRIEND's_IP PORT

Then, to commit transaction, enter:

command> commit RECEIVER1_ID COIN_ANOUNT
command> commit RECEIVER2_ID COIN_ANOUNT
...
command> commit RECEIVERN_ID COIN_ANOUNT

Then, again build the block:

command> build

To get all blocks, run:

command> show

To get your current keypair:

command> key

To generate new keypair:

command> generate

To get any user's balance:

command> balance ID 

At any point, if you get lost, run

command> help

This will print help message.

Development

The project is developed with both stack and cabal.

Building from sources

For building with cabal:

git clone https://github.com/MasterLogick/HaskellCoin
cd HaskellCoin
cabal v2-build

And for starting HaskellCoin just run cabal v2-run

For building using stack:

git clone https://github.com/MasterLogick/HaskellCoin
cd HaskellCoin
stack build

And for starting HaskellCoin just run stack run

Alpha version description:

Minimal blockchain system. The whole chain runs on the local machine without any network rules or transaction signing. CLI only.

Features:

• Commit new trasnactino to pending block
• Build new block from pending transactions
• Show all blocks and transactions
• Show current balance of specified user

Release version features:

• Blockchain explorer
• Migrating to PoW (Proof of Work)
• Saving blockchain to hard drive
• Digital signature for every user (ECDSA on NIST-P521R1)
• Propagating blocks over the Internet
• Network rules