Recently reviewing transaction records, I realized that going crazy at the end of the year is no joke... My current approach is pretty crude: every time I switch positions / cross chains / move in and out of pools, I keep a "voucher package" handy—screenshots + transaction hash + notes at the time (why I did it, from where to where, whether it counts as a cost), and then weekly export exchange transaction logs and wallet details into the same folder. To put it simply, if you don't keep track, the chain won't explain whether that "self-transfer" is income or not. Actually, recently the community has been arguing about privacy coins and mixing coins within the compliance boundaries, I can understand the emotions, but from a reporting perspective, the less clear it is, the easier it is to get stuck; anyway, I’d rather spend less effort than face a bunch of addresses at the end of the year trying to prove my innocence.