Throughout history, different things have been used as money, like seashells, salt, cattle, silver, gold, and government-backed coins. These changes depended on the technology available at the time. As technology has advanced, so has the form of money we use. This progression has brought advantages but also challenges. By studying the past materials and tools used as money, we can identify what qualities are good or bad for money. Only then can we truly understand how #Bitcoin  function as hard money.