Bitcoin mania doesn’t seem to be waning. People are even mortgaging their homes to pour money into the cryptocurrency that started out 2017 being worth $1,000. By Nov. 20 the price of Bitcoin had set a new record, passing the $8,000 mark. On the last day of the year, the value of Bitcoin was $14,129 per coin. How to buy Bitcoin Perhaps you too want to invest in Bitcoin—but you’re not really sure how. Here’s a guide. To be clear, this is not an endorsement for any cryptocurrency, Bitcoin, Ethereum, Ripple or otherwise. It’s also not a suggestion that you should invest in cryptocurrency at all. Here’s what we do know: The markets for these largely untested, unproven digital assets are like teenagers—young and unpredictable. Just look at the volatile ride Bitcoin was on over the Christmas holiday. First, some context. (Want to get right to the buying? Scroll down to the section “How Do I Buy Bitcoins?”) What Is Bitcoin? Bitcoin is a dece...