This is a common true-ish sentence but too vague and in fact inadequate in this topic. The problem lies in how value is measured and this is imo the root of nowadays turmoil.
Ultimately valuable is, what satisfies essential needs (food, shelter, clothing, meds, etc), this is the bottom line. Gold is worthless on its own. Every society revolves around these needs and if not, that society may not last any longer. Only labor provides those values and thus sustains a society but not all members profit from it, "measured", the same way. Income from capital extracts out from labor value. The poor get poorer, while the rich get lazier.
I assume your plan with crypto/gold is to dodge a financial crisis but why should a future society respect the profiteers of the exploitative former? Maybe invest in something that enables labor, eg. land.