Proof of Work (PoW)

Category: science

The consensus mechanism that secures the Bitcoin network by requiring miners to solve computationally intensive cryptographic puzzles.

PoW ensures that adding data to the blockchain is "expensive" in terms of energy and hardware. This cost makes it practically impossible for a malicious actor to rewrite history, as they would need to control more than 51% of the total network hashrate to override the consensus of the honest nodes.

Common Examples

• Proof of Work is the fundamental "trust anchor" of the Bitcoin protocol, decoupling the network’s security from reliance on central intermediaries.
• The difficulty adjustment algorithm in the Bitcoin protocol automatically raises or lowers the PoW target to maintain a ten-minute block interval regardless of hashrate fluctuations.