Proof of Work (PoW)
Bitcoin's energy-intensive security mechanism
Definition
Proof of Work (PoW) is a consensus mechanism used by blockchain networks where participants (miners) compete to solve complex cryptographic puzzles. The first miner to solve the puzzle gets to add the next block to the blockchain and receives a block reward (new cryptocurrency). PoW requires significant computational power and energy, making the network secure but energy-intensive. Bitcoin uses Proof of Work. Ethereum switched from PoW to Proof of Stake in 2022.
Example
Bitcoin miners compete to find a hash value below a target number. The puzzle is so computationally difficult that the network adjusts difficulty every 2,016 blocks to maintain a ~10-minute block time. When a miner solves the puzzle, they broadcast the block, others verify it, and the winning miner receives the block reward (currently 3.125 BTC after the 2024 halving).
Related Terms
Frequently Asked Question
What is Proof of Work?
Proof of Work is a blockchain consensus mechanism where miners compete to solve math puzzles. The winner adds the next block and earns a reward. It is energy-intensive but battle-tested for security, used by Bitcoin.
APA Citation
Last updated:
· Source: VixShield Trading Glossary — From SPX Mastery by Russell Clark
⚠️ Not financial advice. This definition is educational content from the SPX Mastery book series by Russell Clark (VixShield). Past performance is not indicative of future results. Trading options involves substantial risk of loss and is not appropriate for all investors. Always paper trade before risking real capital.