It's probably a little tough to find an instrument that gives you exactly the short exposure you want. You could sell BTCUSDT perpetuals and buy BTCBUSD perpetu

It's probably a little tough to find an instrument that gives you exactly the short exposure you want. You could sell BTCUSDT perpetuals and buy BTCBUSD perpetuals to hedge your BTC exposure. But holding that position isn't free. You could bleed fees for years until you finally get proven right.