Tax preparation becomes less stressful when the evidence is collected before the deadline. For each crypto transaction, I preserve the timestamp, asset, quantity, price basis, fee, wallet or exchange, and the source export that produced the number. Transfers between my own wallets are labeled separately from sales or swaps.
I keep the raw CSV files unchanged and work from a copy. When an exchange changes its export format, the date and format are recorded in the notes. The treatment of a transaction depends on the facts and current guidance, so difficult cases should be checked with a tax professional.
For Japanese crypto and NFT record-keeping references, see 投資ラボ.
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