In plain English
What Proof of work means
In a proof-of-work network, miners compete to find a valid solution to a computational problem. The winner earns the right to publish the next block and receive the protocol reward, subject to the chain’s rules. Because the process consumes hardware and energy, it makes block creation costly to fake.
Why it matters
Proof of work explains how some blockchains secure themselves without staking capital. It affects energy use, equipment needs, network security design, and who can realistically participate in block production. It is also the historical consensus model for Bitcoin and the original Ethereum design.
Example
Several miners gather pending transactions. Each miner repeatedly hashes block data until one finds a result below the target set by the protocol. That miner broadcasts the block, and other nodes verify it. This is simplified; actual difficulty and timing are protocol-specific.
Quick answers
Common questions
Is proof of work still used in Bitcoin?+
Yes. Bitcoin continues to use proof-of-work consensus.
Is proof of work the same as mining?+
Mining is the process of participating in a proof-of-work network; proof of work is the consensus mechanism that makes mining meaningful.
Sources