Ok, let's clear ALL the misconceptions here.
Here's how it works.
You deposit bitcoin with FreeBitco.in - either new deposits or that which you've earned from the faucet.
THE INTEREST: The annual percentage rate offered is 4%, so your balance left in the account for a year will have paid 4% (actually a tad more)
THE PAYMENTS: The interest is paid daily. Which means that each day you are paid 1/365th of 4% on the balance you have that day...this is your daily percentage rate. So, you are paid 0.0109589% each day. Payment timing is randomized each day to keep people from only depositing money for the interest payment and then withdrawing the money the same day.
THE COMPOUNDING (of interest): If you leave your balance untouched the interest you earned today will add to your balance upon which you'll earn interest tomorrow. If you do this for a year you'll actually earn more than 4%, you'll earn 4.08%...this is your annual percentage yield.
THE APPRECIATION: And while your bitcoin is in the account with FreeBitco.in it will benefit from the price appreciation (or depreciation) that naturally occurs in the market over that year. If bitcoin value goes up 20% this year you also gain that 20% appreciation in the bitcoin you have on balance with us (or in any wallet). Your balance with us is yours, you're not selling it to us.
To see the amount of interest you've earned go to the "EARN" menu. You'll see (1) a weeks worth of interest payment history, (2) your current balance, (3) the interest payment you'll expect to receive tomorrow, (4) the interest you'll expect to receive over the next 30 days, (5) the interest you'll expect to earn over the next 365 days, and (6) an interest calculator so, for example, if you want to deposit
BTC10 of your holdings you can immediately calculate how much interest you'll earn daily, monthly, and yearly.
Does this clear up what we're offering here? There's been several comments that indicate some confusion. I'm happy to answer any and all questions!
I don't think you actually understood what the offer was exactly. You will have to deposit bitcoin on freebitco and after a year 4% of the bitcoin will increase. Example if.you deposited 1 btc after a year it would 0.04 btc increase. While the price of bitcoin keeps changing you can expect a return of 19% a year which is way more than your bank