Bitcoin (CRYPTO: BTC) trades below $84,000 Wednesday morning, and one trader who called last October's crash says he's shorting the market again. Why Doctor Profit Is Betting Against Bitcoin Widely-followed crypto trader Doctor Profit posted on X that he sold his entire Bitcoin position near $124,000 last October and built a short position ahead of the Oct. 10 crash, when altcoins lost up to 95% in hours.