What can I trade with bitcoin without having to give out private details like name and address? (Imagine I don't even have a name or address.) I'm looking for stores of value like gold or stocks. Naturally litecoin and other cryptocurrencies fit, but I'm looking for more than that. And alpaca socks, though they may be durable and resalable, may lose value after a perception of being "used", and therefore are not a good store of value.