I have close to 100K in bitcoin in different accounts. I own some in Coinbase. I am planning to borrow around 60 to 70K USD as a loan for 1 year. I prefer to borrow as a interest-only loan, where I pay 1/12th of the interest every month.

Coinbase changes the public key of the wallet. It is not letting me sign messages. If you like to confirm that I have BTC collateral in my account, I can show a screenshot from my Coinbase account.

https://drive.google.com/open?id=0Bw5Ltg6CklBydnZoaHE5MlI0LWc

 If you are interested, please PM me.

Roughly Right