Reply to your half-sentence "Isn't it okay to just organize it at the end of the year": I really can't do that... I did it that way last year, and in the end, facing dozens of addresses plus exchange transaction histories, I was exhausted. Now I have a simple method: every time I make a large transfer/rechain/participate in an airdrop, I casually put the hash, time, counterparty, and a screenshot at the time into a spreadsheet, with a note saying "Why I did this." Especially for bridges going back and forth, honestly, it's the easiest to miss. Recently, modularization and the DA layer are hot topics, developers are talking excitedly, but as a user like me who just wants to ask: which chain does this transaction actually belong to... Anyway, I keep the evidence first, and there's no rush to deal with taxes at the end of the year.