In the future, Bitcoin will be so valuable that people will start to use it as a form of payment for time travel services. Time travelers will be able to pay for their trips using Bitcoin, and miners will be sent back in time to mine for even more valuable Bitcoins. There will be Bitcoin time travel museums where people can pay to see what the Bitcoin price was in different eras of history. Eventually, Bitcoin will become the ultimate time machine currency, with its value going up or down depending on what era it's being used in.