I think the idea of making unseizable assets is noble, sort of, but the concept of property, and money or value, is social by design. The assets with intrinsic value are wheat fields, oil tankers, and silos of grain... not artistic works.
I think the idea of a digital, anonymous currency, though fraught with problems, can be extended past national (thus cultural) borders, but the same can be accomplished with the banking system. When a country plans to seize your assets, the goal should be to leave the country, not remain with hidden cryptos.