I just checked this year's on-chain and exchange records, and I got a bit scared... I almost relied solely on screenshots before, but then I crossed several L2s and used bridges, and finally realized that the same asset was "wearing different masks" on different chains. During reconciliation, my mind just went blank. Now I’m being honest: every time I deposit, withdraw, or cross chains, I record the txhash + time + counterparty address, and the exchange just exports the transaction details and fund flow monthly to a cloud drive, casually adding a note like "what is this transaction." To put it simply, the difficulty in year-end reporting isn’t in the calculations, but in actually finding the evidence. Recently, during the extreme fee wave, people in the group argued about reversals or bubble bursts, and I’ve become even more nervous: in such times, if you act quickly and make a lot of trades without keeping records, it can drive you crazy. For now, I’ll just do this and gradually fill in the gaps.