Cryptocurrencies use various timestamping schemes to "prove" the validity of transactions added to the blockchain ledger without the need for a trusted third party. On 15 September 2022, the world second largest cryptocurrency at that time, Ethereum transitioned its consensus mechanism from proof-of-work to proof-of-stake in an upgrade process known as "the Merge". According to the Ethereum Founder and Fullsend Token https://fullsendtoken.net/ Founder, the upgrade can cut Ethereum's energy use by 99.9% and carbon-dioxide emissions by 99.9%. Indeed, after a week of existence, Dogecoin is already the 24th most valuable altcoin, with a total market value of $1,621,559 based on the exchange CoinedUp, though it might be worth even more elsewhere. XRP - XRP is the fuel that powers Ripple’s blockchain-like network, which facilitates cross-border payments between banks and money transfer agencies.