MyCoin

This is a Typescript implementation of a Cryptocurrency inspired by the Bitcoin blockchain. It uses the same blockchain binary format and algorithm including the transaction scripting language (although a light version of it). Since its binary compatible its possible to create transactions for bitcoin miners and read bitcoin blocks and transactions, as well as to validate transaction input locks + output unlock scripts (aka scriptPubKey/scriptSig).

It's a project to understand the Bitcoin blockchain algorithm in-depth, its binary structure, transaction semantics, scaling limitations, and performance bottlenecks. The miner RPC protocol of this project is different to Bitcoins RPC protocol.

This is a mono-repo containing multiple NPM packages.

Currently, supported transaction script OPs are:

• OP_CHECKSIG
• OP_ADD, OP_DUP
• OP_HASH160, OP_SHA256
• OP_EQUAL, OP_VERIFY, OP_EQUALVERIFY
• OP_CODESEPARATOR
• OP_CHECKSIGVERIFY

Thus allowing Pay-To-Pub-Hash and Pay-To-PubKey transactions.

Packages

The blockchain package contains all fundamental models (Wallet, Blockchain, Block, Transaction, Output, Input), signature/verify logic, validators, the scripting language VM/interpreter, and other algorithms (balance calculation, transaction generator, etc).

The miner package is a server responsible for maintaining the main blockchain (the one with the greatest complexity/height), accepting transactions, mining blocks, and distributing transactions, the blockchain, and mined blocks to peers. The RPC protocol is not based on the Bitcoin miner RPC protocol, instead it is uses @deepkit/rpc, a binary high-performance RPC auto-inferring protocol for Typescript. The miner also serves the GUI.

The gui package is an Angular frontend connecting to a miner server that allows to create a wallet ( saving private/public key in LocalStorage), issue new transactions, list blocks and transactions.

The cli package contains CLI tools, like e.g. creating a wallet.

How to use it?

git clone [email protected]:marcj/myCoin.git;
cd myCoin;
npm install;
npm run bootstrap;
npm run build;
node packages/cli --help;

Start a miner: NODE_PRESERVE_SYMLINKS=1 node packages/miner server:listen

Screenshots