The immense power consumption is mainly the result of the proof-of-work (PoW) consensus mechanism. This consensus algorithm requires high computational power to solve a mathematical puzzle in order to validate transactions, while many computers compete with each other in order to solve the puzzle and extend the blockchain with new blocks. The decentralised approach to validating transactions and amending new blocks to the blockchain allows for resilience and immutability, yet, coming at the cost of high resource intensity.