When all bitcoins are mined, the shift towards miners relying solely on transaction fees becomes inevitable. Ethereum and Bitcoin, despite differing in their goals, coexist and complement each other. Ethereum, with its focus on smart contracts and decentralized applications, provides tools for innovations in this field. Both blockchains remain significant players, their coexistence allowing for a broad spectrum of problem-solving, fostering technological advancements. The prospects of blockchain technologies promise new opportunities across various sectors, from finance to societal applications.