If you need a hedge you're going to have to use cash or precious metals (gold, silver or platinum)...
I don't think bitcoin yet has a reputation not to crash bad... Its probbay better than some stocks but not all, some places like the utilities and commodities should do well I wouldn't put all of my faith in crypto it'd be a bit like buying an airline stock...
That's the best way to do it, never put all your faith into just one asset and diversify your portfolio to different assets of different markets, for example you can use 50% of your portfolio and buy Bitcoin and Ethereum and you can invest the other 50% in valuable metals like gold or silver
For this to work out, you need to buy physical metals
But not many people would actually go for that because physical metals are pretty cumbersome to buy and store (not even speaking of hefty premiums). If you are investing in paper gold (under whatever name), you are not actually diversifying your portfolio as a way to mitigating risks since you are still vulnerable to systemic collapse (read, all paper will burn)
That way if gold crashes for example you have still crypto to make up for the possible loss, but keep in mind that crypto and gold/silver tend to follow each other sometimes so it's not 100% safe strategy but it's definitely better than just investing all in one asset
Gold is unlikely to crash much and for long. But if that nevertheless happens (without any viable reason), it will be a good day to buy hard