And if you simply have multiple wallets and try and maintain the appearance of being disconnected, can you move funds between them without establishing a connection that unmasks you?
to clarify: it can be hard to prove that two crypto addresses are the same people
Is that a high bar? I mean, you could have said that about forensic fiber analysis—and then it was revealed that the entire history of the field was just expert witnesses lying their asses off for whatever conclusion law enforcement wanted. It turns out that to prosecute criminals, being complex enough that expert witnesses can provide a smoke screen to rationalize law enforcement targeting that is actually based on prejudice and not concrete facts can be sufficient.
e.g. police look for online drug dealer with blockchain data, get warrant, bust down door, find big pile of drugs.
The point being, the data might not be "proof" on its own but it absolutely illustrates that there is no privacy on public ledgers.
Again, I’m assuming traditional “old school” non-privacy cryptocurrencies.
Kepp in mind, tumblers have also been found to keep logs that ended upp in law enforcement.