10% interest rate per year is not enough, I think rate must be higher. And the second question would be the trust - how can measure the BTC bank trust, if you are going to transfer them higher BTC amount ?
If the rate is too high, over the level any legit businesses can afford to pay, I can guarantee the bank is Ponzi! I have a link share with you
http://coinour.com/index.php/earning-bitcoin-interests/The Bitcoin banks are backed by the underlying solid business , like Chbtc, Huobi (top exchanges ) , and mining industry Haobtc . They are paying stable interest for a few years! You could try with small part of your Bitcoin!