In practice people do lend bitcoins. Of course they do, and the entire system does not demand anonymity or non-accountability. If someone actually wanted to sho

In practice people do lend bitcoins. Of course they do, and the entire system does not demand anonymity or non-accountability. If someone actually wanted to short bitcoin in such a way, they can do it right now. Shorting is, as in the normal securities market, a dangerous gambit because the downside is infinitely larger than the upside. But if someone wanted to do it they could.