Don't laugh, every time I see someone hyping up L2 as fast and cheap, my first reaction isn't to think about ecological subsidies, but to think: Oh no, another chain to reconcile... The pile of transaction records for year-end taxes can really drive you crazy.

I'm pretty old-fashioned now: if I can export it, I do it immediately, keeping a copy on the exchange/wallet/on-chain explorer, and don't expect to remember why I transferred that amount half a year later. Especially for failed transactions, retries, changing nonces—on-chain it just looks like a string of hashes, but in reality, it's the same thing bouncing back and forth, and without notes or labels, you can't match them at all. Plus cross-chain bridges, gas fee payments, airdrops received and transferred again—timestamps on different chains are inconsistent, basically setting up landmines for yourself.

Anyway, I now get into the habit of spending ten minutes each week dumping tx hash + notes into a spreadsheet, so I don't have to play archaeologist on myself at the end of the year. As for taxes, I don't aim to save money, just to avoid crashing.