When an investment becomes worthless (or almost worthless in this case) you can take the loss as soon as you are certain that it is done. Sometimes that means the court case finishes or you get a report in the mail. In your case that means you received a final settlement and you're done.
So what you will need to do in this case is figure out the value of what you had in Celcius (not what it was worth, what you actually paid for it). And then you will enter the transactions as -
Date purchased - actual purchase date
Amount paid - what you actually paid for the crypto
Date sold - the date that you received the settlement
Amount sold - the value of the crypto you received on that date
You could lump it all in in one transaction and call it the Celsius settlement or you could do it in three s\transactions based on those three types of currency that you listed. If you do it the second way then it sounds like two of them would have a profit and one would be a total loss which probably offsets everything. But that's up to you.
Lastly, you'll be left with cryptocurrency that you'll be carrying forward. That will have a purchase date of the date you received the settlement and a basis or cost equal to the amount you entered for it's value an the date that you received it. That will be information to file away for when you sell it.
@alkaloid
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