In blockchain technology, Proof of Work (PoW) was the first consensus mechanism introduced on the Bitcoin network. With the PoW system, decentralized networks can confirm blockchain transactions and add new blocks without needing a central authority, promoting network security. Proof of Work blockchains depend on miners who solve cryptographic puzzles or hash functions to validate transactions, requiring significant computational effort. Miners are compensated with block rewards and transaction fees.
As miners compete, the first one to solve the puzzle gets a chance to add a new block to the network, such as the Bitcoin blockchain. Therefore, a miner’s computing power determines their chances of being selected. Unlike Proof of Stake blockchains, PoW mining systems require a lot of mining power. This is because miners need specialized equipment with high energy consumption to solve difficult mathematical puzzles and add new blocks to blockchain networks. The need for so much energy has a negative impact on the environment.
To prevent bad actors in Proof of Work networks and ensure blockchain consensus with valid blocks, nodes must prove that they used computational power.
