100 or more, you can imagine how much money youd need to bring to a transaction to make a major Bitcoin investment. You should take the same precautions you would with a Craigslist transaction or any transaction where youre meeting an individual stranger to hand him or her cash in exchange for something else. Developed countries have more options and more liquidity. The internet made information global and easy to access. How to buy bitcoins (with credit card or bank account how to protect and properly secure your bitcoins if you do decide to invest.