Bitcoin, as a crypto, can be spent and is maintained in the ledger, telling others who is paying whom, how much and when. Bitcoin uses this blockchain. This blockchain-based application demands enormous energy for miners to create and validate a code. However, on September 15, 2022, a landmark date, Ethereum for the first time cut down the energy consumption by 99 per cent through a new protocol called the Merge. In Bitcoins, miners hasten to solve mathematical puzzles to verify transactions called proof-of-work. In Ethereum Merge, these are replaced by Proof-of-Stake. Here the validators deposit 32 ETH or around $50,000 to validate transactions. In fact, they act as guardians and get paid for it. Proof-of-Stake makes Ethereum much more akin to a financial asset. It may invite security regulation. Whether Merge will succeed or not will be clear in the coming few weeks and months. However, it is a major upgrade of the crypto operating system.