Proof-of-Work involves solving complex mathematical problems which ensures a consensus about the state of the distributed ledger is reached by all network participants. Before a new block can get added to the PoW blockchain, all previous transaction data must be reconfirmed by cryptocurrency miners, which are compensated for employing their computational power with block rewards. While some smaller and fastest coin to mine are consumer-grade CPU and GPU mineable, the biggest PoW coins need specialized ASIC mining hardware.