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The exchange where you traded BTC for USD, which had to comply with AML and KYC laws in order to have access to the US banking system in the first place.
Like, it’s theoretically possible to work with perfect operational security and never ever link your Bitcoin address to the real world, but doing so basically precludes you from doing anything in the real world with it, including buying crypto in the first place.
Yeah, mate. This is the most credible source I can find and it’s literally about how impossible it is to actually use crypto without tying yourself to the wallet somehow.