Proof of Work vs. Proof of Stake
Proof of work and proof of stake are two ways blockchains agree on the truth. Here is how each secures a network and where they differ.
Key takeaways
- Proof of work, used by Bitcoin, has computers called miners compete to solve a hard mathematical puzzle.
- Proof of stake replaces miners with validators who lock up, or “stake,” the network’s own coins.
- Proof of work is battle-tested and simple but energy-intensive.
Blockchains need a way for thousands of computers to agree on a single, shared record without a central authority. The mechanism that does this is called a consensus algorithm, and the two best known are proof of work and proof of stake.
Proof of work
Proof of work, used by Bitcoin, has computers called miners compete to solve a hard mathematical puzzle. The first to solve it earns the right to add the next block and collect a reward. Solving the puzzle takes real electricity and hardware, which makes attacking the network expensive — security comes from that cost.
Proof of stake
Proof of stake replaces miners with validators who lock up, or “stake,” the network’s own coins. The protocol selects validators to propose and confirm blocks, and a validator who behaves dishonestly can lose part of their stake. Security comes from having capital at risk rather than from energy use.
The trade-offs
Proof of work is battle-tested and simple but energy-intensive. Proof of stake uses far less energy and can settle faster, but it is newer and raises different questions about how influence concentrates among large stakers. Both aim for the same goal: making it costly to cheat.
Editor covering blockchain, crypto and finance news. Based in Manila.
