Single miner full-node implementation of a PoW blockchain running on one machine, based on the source code from https://github.com/ChainShot/PoW-Chain.
- Start up the server with terminal
node index- Open a new terminal tab and change directory into the scripts, run startMining.js to get the blockchain started. Switch to the first terminal tab to see each block as it is mined
cd scripts
node startMining- When you're done playing with the blockchain, run stopMining.js in the scripts folder. The blockchain state is saved to a local file at
./block-state/blockchain.jsonwhich is loaded the next time you start mining.
node stopMining✅ Blockchain state saved and read locally
✅ Uses bitcoin's UTXO approach for keeping track of account balances
✅ Block difficulty automatically adjusted every 10 blocks by a factor of 2 when average blocktime deviates 10% from the desired value of 10s
✅ Send valid transactions to the mempool for the blockchain to process using the following code. Replace the fields in <> with the appropriate values:
node sendTransaction <sender address> <amount> <recipient address> <fee to miners> <signature> See next point for how to generate valid signatures.
✅ Uses elliptic library ECDSA signatures for authenticating transactions. Generate a valid signature hash by making changes to the parameters in the offlineSignature.js file and then run it node offlineSignature.js. This is done for security purposes.
- Build a frontend for easier submission of transactions
- Allow multiple nodes/miners to connect to network for mining
- Broadcasting of new blocks to network
- Ability for network to come to consensus