In contrast with fiat currency like the U.S. dollar, where the Federal Reserve can simply print more banknotes, Bitcoin's supply is finite: BTC is designed with a maximum supply embedded in its design, of which approximately 89 percent had been reached as of April 2021. Despite more powerful mining equipment, Bitcoin is expected to run out by 2040. Every four years, mining becomes exponentially more difficult and power-hungry, part of Bitcoin's original design. In 2021, a Bitcoin mining transaction could equal the energy consumption of a small country.
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