thanks, I work at a financial institution, so I "Googled" it a few times, short selling is based on borrowing the underlying securities - not owning them - or alternatively owning a(n often bespoke) derivative, related to those securities, which behaves as a short.
Not really, you can be long in one market, and short in the derivatives market, and your net position be short. You'd be holding eth, but you'd be short.
> If you own a large amount of a currency, you want to ensure that the currency in question is trusted, or otherwise that currency would end up losing its value.
is fundamentally flawed. You can own a large amount of a currency and profit from it losing its value.
If you own a security you are long, not short.