> Money, in other words, mostly measures trust. This is less obvious for precious metals or cryptocurrencies because they have an intrinsic value of their own as well Cryptocurrencies have intrinsic value? Did the author intent to write that or was it an accident? S/he has grouped precious metals, which have purposes from engineering to jewellery - with solutions to arbitrary cryptographic problems, which are useless…
The intrinsic value of a cryptocurrency is in its utility: moving an accounted and measurable unit across the internet peer to peer.
The answer to "What is this item [the bits comprising your private wallet key] worth on its own?" is "Nothing" for cryptocurrencies, much like a 5 Euro bill is worth essentially nothing on its own. A gold bar or a bucket full of copper cents has an intrinsic value: it's metal that can be used for many engineering purposes.