Ethereum is an open-source blockchain platform and the second-largest cryptocurrency after Bitcoin. It features the ability to create smart contracts and decentralized applications (dApps) without an intermediary. Its native currency, ETH, is used to pay transaction fees on the network. Ethereum represents a breakthrough in the world of cryptography because it is not only a currency, but also an integrated system that supports development and innovation in the fields of finance, gaming, and digital property. In 2022, the network transitioned to a Proof-of-Stake (PoS) system to reduce energy consumption.