Simple Blockchain

This application is a simple blockchain implementation. There is functionality for creating transactions, putting them in the transactions pool, verifying, mining the new block and adding to the blockchain.

Setup

You need to have Elixir 1.6 and Erlang/OTP 20. Detailed installation instructions can be found at: http://elixir-lang.org/install.html.

How to use Simple Blockchain

Fetching dependencies

mix deps.get

Starting the application

Start the application in interactive Elixir mode:

iex -S mix

Start the miner

iex> Blockchain.Miner.Worker.start()

This will continuously mine new blocks until you stop the miner.

Mine only one block

iex> Blockchain.Miner.Worker.mine_one_block()

This will mine only one block.

Stop the miner

iex> Blockchain.Miner.Worker.stop()

Get the latest chainstate

iex> Blockchain.Chain.Worker.get_state()

There is information about last block in the chain and accounts with their tokens

See transactions in the pool

iex> Blockchain.Pool.Worker.check_pool()

Example

To interact with blockchain first of all you should have some tokens. To generate them you have to start miner for at least 10 seconds.

iex> Blockchain.Miner.Worker.start()

Stop the miner:

iex> Blockchain.Miner.Worker.stop()

You can check your balance in the chanstate:

iex> Blockchain.Chain.Worker.get_state()

To create a transaction you should have private and public key.

• Create private and public key:

iex> private_key_miner = Blockchain.Keys.Mock.private_key_miner()
iex> pub_key_miner = Blockchain.Keys.Mock.pub_key_miner()
iex> private_key_1 = Blockchain.Keys.Mock.private_key_1()
iex> pub_key_1 = Blockchain.Keys.Mock.pub_key_1()

• Then, build the transaction:

iex> alias Blockchain.Structures.Transaction
iex> alias Blockchain.Structures.SignedTx
iex> alias Blockchain.Pool.Worker, as: Pool
iex> data = Transaction.create(pub_key_miner, pub_key_1, 100)
iex> tx = SignedTx.sign_tx(data, private_key_miner)

• Next, add the transaction to the pool:

iex> Blockchain.Pool.Worker.add_tx(tx)

• To check what is in the pool:

iex> Blockchain.Pool.Worker.check_pool()

• To mine one block

iex> Blockchain.Miner.Worker.mine_one_block()

If you have enough money the transaction will appear in the new block. Otherwise the transaction will stay in the pool.

• Check the state to see if yout transaction is in the new block.

iex> Blockchain.Chain.Worker.get_state()