You have a screenshot! It shows your FMV at a specific point in time. This was a forced liquidation. Your value before is shown - proven versus the proceeds of what you received to show a capital loss.
Let's make a log:
Cost Basis - The GSUD is stable and you don't need a log to prove xGSUD =$x. Your screenshot is your proof.
Date acquired will be the date you deposited into Celsius (or estimate)
Date sold - use the bankruptcy date or when you received the BTC
Proceeds - FMV of the BTC on the day you received it
If the IRS asks for more:
bank statements showing the outgo of funds
emails: statements, reward, balance - shows you actually were the owner
Two final thoughts:
1. Ionic digital stock has a separate basis - if you received it.
2. If you decide to mail the 8453, it may go a long way to include a brief statement explaining the records were lost due to the Celsius bankruptcy and that you used available data to reconstruct the basis in good faith.
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