₿ Bitcoin Mining — Proof-of-Work

What It Demonstrates

This simulator shows how Bitcoin proof-of-work mining operates. Miners repeatedly hash a block header with different nonce values until the resulting hash begins with a required number of leading zeros (the difficulty target). The more zeros required, the harder it is to find a valid hash — exponentially more attempts are needed on average. When a miner succeeds, a new block is added to the chain and the miner receives a block reward (currently 3.125 BTC after the 2024 halving).

How to Use

• Click Start Mining to begin the nonce search.
• Adjust Difficulty to change the number of leading zeros required.
• Increase Miners to see competition between multiple miners.
• Watch the Current Hash panel to see hashes being tested in real time.
• The blockchain at the bottom grows as blocks are found.

Did You Know?

Bitcoin's difficulty adjusts every 2,016 blocks (~2 weeks) so that on average one block is found every 10 minutes, regardless of total network hashrate. As of 2025, the Bitcoin network computes over 700 exahashes per second — that's 700,000,000,000,000,000,000 hash operations every second. This simulator uses a simplified hash function for demonstration purposes.