What is Proof of Work?
Proof of Work requires miners to find an input whose hash meets a difficulty target. The work is hard to produce but trivial to verify, which makes the chain expensive to attack while remaining cheap for honest participants to follow.
Why Proof of Work matters
Understanding Proof of Work is part of building a solid mental model of how Bitcoin, blockchain and Web3 systems actually work. Concepts in the Bitcoin category sit at the foundation of the broader stack — get them right and the rest is far easier.
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Reading the definition is a start. ZeroToBlock teaches concepts like Proof of Work through hands-on, browser-based simulations. Build the mental model by actually using it:
- Bitcoin 101 — interactive fundamentals course
- Bitcoin Proof of Work — mining, hashing and consensus
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Related terms
- Mining — Producing new blocks by performing Proof of Work.
- Consensus Mechanism — The rules a network uses to agree on the canonical chain.
- Difficulty — A parameter that controls how hard it is to mine a block.
- Nakamoto Consensus — Bitcoin's consensus rule: follow the chain with the most work.
More bitcoin terms
- Address (Bitcoin / Crypto Address) — A public destination for receiving cryptocurrency.
- Block Header — The metadata at the top of each block.
- Block Reward — New coins paid to the miner of a block.
- Double Spend — Attempting to spend the same coin twice.
- Halving — The scheduled 50% cut in Bitcoin's block subsidy.
- Hash Rate — The total computational power securing the network.
- Nonce — The number miners change while searching for a valid hash.
- Confirmation — A block built on top of the block containing a transaction.
Keep exploring
Continue with the full blockchain glossary — 136 terms in total — or read the developer blog and FAQ for deeper context.