Recently started to review my tax situation. Honestly, it's not afraid of paying taxes, but afraid of crashing from flipping through transaction records at the end of the year... My current obsessive-compulsive approach: every time I open/close a position, deposit/withdraw, or transfer on-chain, I take a screenshot + export a CSV file and upload it to the cloud drive, naming it by date + exchange/blockchain, otherwise there will be a bunch of "internal transfer" that don't match at all. And those large on-chain transfers, hot and cold wallet movements, everyone loves to interpret as "smart money," but for me, they are more like reconciliation clues: where the money came from, where it went, if the path is clear, the declaration won't be written as mysticism. Anyway, I first keep all the transaction records, and how to calculate profit and loss can be refined later...