You definitely won't get much more than you get now

And if Bitcoin flies to the moon, the interest rates are likely to decline. I don't know your reasons for making this investment (I mean the interest accumulated will be small to make a real difference anyway), but have you tried investing in the casino bankroll of the dice sites which allow such investments and pay dividends from their earnings? While it may look riskier, but when you come to think of it, it is still the same systemic risk mostly (of hacks, inside jobs, extremely lucky whales, etc)