[hlasdjlfhalwjk]

Bitcoin is pseudonymous. Every member can be uniquely identified but if you are careful not to link your pseudonym (e.g. wallet address) to any personally identifiable information, nobody else can. But this is really hard when it is about money since in general you'd want to spend that money an that's where the link appears. As long as you don't spend the money, there is no information to link.

[as300]

There are ways around this problem. See: https://local bitcoins.com

Doesn't completely de-anonymize you but it does reduce the set of people who have uniquely identifiable information to 1

[ajkdhcb2]

That site requires identification. So the owner of the coins is known by everyone with the dataset (which that will be shared with chain analysis companies), as well as the website owners and the trader you trade with. Pretty big set

[Darvon]

Monero