I set a rule for myself: after every deposit or withdrawal, chain swap, or airdrop operation, I immediately keep a "comprehensible proof" of the transaction record; otherwise, facing a bunch of hashes at the end of the year can really drive me crazy. To put it simply, I don't expect the platform to always keep a complete history for me, and on-chain data isn't always something I can match with fiat costs with one click... So now I get into the habit of casually saving a screenshot + exporting a transaction history, and writing a couple of notes: what this transaction was for, which card or channel I used at the time. Recently, with some regions tightening or loosening tax and compliance policies, my mindset about deposits and withdrawals really changes. Anyway, I prefer to be a bit more troublesome now than to have to scramble for documents and doubt my life later. That's it for now, a bit of spice in the noodles is fine, but don't mess up the accounts.