A ledger is a database technology used to record transaction histories and ownership; it is a definitive account of who has given what to who, and who owns what. Most ledger technologies are physical and they’re centralized -- they’re controlled by a central bank.  This means that they are subject to the discretion and power of individuals, and are alterable and impermanent. This gives those ledger recording entities a tremendous amount of power over an individual’s financial transactions; it also means the ledger is vulnerable to manipulation.
Pro Tip:If you want to invest, but aren’t keen on using your own funds, consider utilizing accrued interest on a savings account to invest. Compare savings accounts and their interest rates. If you put a lot of money into savings every year, you could fund a sizable investment with just the money the bank pays you in interest. It eliminates your personal risk and maximizes your chances of a return.
While futures products still carry unique and often significant risks, they can potentially provide a more regulated and stable environment to provide some exposure to bitcoin as a commodity as well. You should carefully consider whether trading in bitcoin futures is appropriate for you in light of your experience, objectives, financial resources, and other relevant circumstances.