01
Proof of Work is a consensus model in which a participant earns the opportunity to publish the next block by solving a computationally difficult problem that other participants can verify relatively easily.
supportedLearn this concept
Turn the idea into understanding.
Knowledge map
See where this idea fits.
Before this
Prerequisites
This concept can be approached without a defined prerequisite.
After this
Builds toward
No downstream prerequisite links are published yet.
Evidence first
Verified knowledge behind the lesson.
02
In Bitcoin, mining repeatedly changes block-header data such as a nonce until the resulting hash is below the network's target threshold.
supported03
Bitcoin block headers include the previous block's header hash and the Merkle-root hash, and the header is hashed as part of Bitcoin's proof-of-work algorithm.
supported04
Bitcoin nodes resolve competing valid chains by following the chain with the greatest cumulative proof of work, not simply the chain containing the greatest number of blocks.