Not saying everyone should jump into crypto, just be aware that most things without physical value are based on confidence. Which I’m sure you understand.
- Gold is a naturally occurring substance and, while not abundant, exists in many parts of the world.
- Gold is inert.
- Gold is not radioactive
- Gold is durable, but malleable.
This is really not the only difference. As Elon Musk recently said, the government has a "monopoly on violence" and acts as an authority that arbitrates disputes (up to and including between countries), works to ensure proper controls and regulations through laws, etc., all of which helps to underpin the value of the currency. Cryptocurrencies are backed by no central authority with these powers.
Also important is that the state has a monopoly on legitimate violence. It has social license by virtue of exercising violence to uphold social order. In the case of the economy that means its macroeconomic management to ensure stability and the public good. Clearly crypto woefully fails by that standard.