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by thoughtfunction 2624 days ago
If you didn't keep proper records, then use the cost basis of your crypto as 0 and report the sale price as pure profit. You will never under pay your taxes that way, and if your numbers are low enough, it's probably worth it to overpay on taxes than to spend the time recovering detailed records of what happened in between.

If it's too big of a number for you, then better remake / recover those records. Luckily you have a permanent record called the blockchain.