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Proof of Work

Bitcoin miners compete to find a nonce that, when combined with a block header, produces a double-SHA256 hash with enough leading zero bits to meet the network's current difficulty target. That's it. Below is a real 80-byte Bitcoin block header. Hit Start, and your browser will hash variations of it as fast as it can.

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Hashrate

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Nonce

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Best zero bits

Live hash streamMost recent 20

Idle. Press Start.

Best hash this session

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You vs. the network

Bitcoin's global hashrate dwarfs any single machine by ~14 orders of magnitude. The whole game of proof-of-work is that this number stays uneconomic to fake. Here's where you actually sit on that scale.

Your hashrate

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Network hashrate

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Network difficulty

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Your share of network

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Logarithmic scale (H/s)

Time to find a block at your hashrate

Start mining to find out.