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The truth is there are some currencies that are by design untrackable—monero and zcash, for example, which use privacy preserving techniques to avoid tracking. (IMO zcash is a better implementation than monero, but shrug.)

Bitcoin and ethereum and most other crypto currencies are absolutely traceable in the sense that anyone can see who you send your money to. And all of the implementations have the core challenge of getting back to fiat—at some point, you withdraw cash or otherwise pay a real person to do something for you. There’s no way around that.