Proof of Work

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Miners on a Proof of Work (PoW) blockchain collect transactions posted on the blockchain network, put them in a block an fix a complex mathematical problem. The miner that finds the solution to that problem first can put the block on the network and is rewarded e.g. by receiving an amount of the the cryptocurrency on that blockchain.

Miners with faster computers will usually be the the first to find a block. This make mining expensive, you need the right equipment and the power to run it.

Examples of PoW blockchains are BitCoin, Ethereum and LiteCoin.

On the BitCoin blockchain every 10 minutes a block is created, the difficulty of the problem to fix is automatically adjusted to keep this frequency. So, more miners with fast computers, mean faster block generation, meaning greater difficulty meaning more energy or faster hardware is to be used.

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