example PoW blockchain

Blockchain.rs

// The blockchain itself - a collection of blocks
struct Blockchain {
    chain: Vec<Block>,
    difficulty: usize,
}

impl Blockchain {
    // Create a new blockchain with genesis block
    fn new() -> Blockchain {
        let mut blockchain = Blockchain {
            chain: Vec::new(),
            difficulty: 2,  // Require 2 leading zeros in hash
        };
        
        // Create the first block (genesis block)
        blockchain.create_genesis_block();
        blockchain
    }
    
    fn create_genesis_block(&mut self) {
        let mut genesis = Block::new(
            0, 
            "Genesis Block".to_string(), 
            "0".to_string()
        );
        genesis.mine_block(self.difficulty);
        self.chain.push(genesis);
    }
    
    // Add a new block to the chain
    fn add_block(&mut self, data: String) {
        let previous_block = self.chain.last().unwrap();
        let mut new_block = Block::new(
            previous_block.index + 1,
            data,
            previous_block.hash.clone()
        );
        
        new_block.mine_block(self.difficulty);
        self.chain.push(new_block);
    }
}