Furthermore, cryptocurrency brings a whole new set of (so far) necessary properties. There's no need to compartmentalise "classical money" properties from those which have been added during it's subsequent evolution.
I think it is important to determine what you "have" to have in a money instrument vs. what is "nice" to have vs. what "derives" from other properties. When arguments on which altcoin might be better start, the differences in opinion seem to often come down to this. I don't think the properties of ideal money have changed just because we are using a digital medium now. I also think with the right "have to have" properties, that you can layer on top of that the "nice to have" aspects. Anyway the market will decide.
So, new innovations in anti-money tools don't change the fundamental characteristics of money itself?
My personal view is I do not believe so.
The reason is I have not seen any anti-money tools that are not defeated by the six main properties working together.
Gold was attacked by anti-money tools (bank notes) because it was not very portable, and as a result people stopped using it directly and governments were able to circumvent gold over time. Bitcoin is very portable and perfectly fungible, this makes anti-money tools harder to deploy. For anything I can imagine they will throw at Bitcoin, it seems trivial to layer additional usage mechanisms on top of the protocol as needed. If bitcoin wasn't portable, fungible, divisible, etc this wouldn't be the case.
@ bolded: I would argue that intangibility and being cryptographically driven are far more important properties for cryptocurrencies to counter anti-money technology. Intangibility is definitely a new development in money (people remembering doesn't necessarily count, figuratively and literally ), and it is not derived from the original 7 at all.
It will be interesting to see how the opinions of monetary theorists of this century will eventually settle on this issue (I have no doubt it will become a relevant debate, even if the conclusion is against an expanded group of properties)
I agree with intangibility being a benefit, we might have different definitions here though, how are you defining this?
A problem for gold as money was always that most people did not seem to understand that physical gold was simply a means to a global ledger. Instead many thought gold as money derived it's value through some sort of value gold had in itself (i.e. as jewelry or metal), but this was wrong. An intangible ledger makes it very clear exactly what money is and separates it from any other forms of value. Money is simply and honest stable mechanism to keep score, it has no value other than that which we place on it.