I am thinking one can break a #Bitcoin KYC trail if they sell BTC for physical cash in-person.

Theres no bank record, theres no evidence of what price you accepted, and its not obvious that its even been sold.

Ideally you'd do this with a friend or acquaintance with lots of cash, such as a business owner.

For example, zero people report their capital gains on their cash sales at a flea market.