After the 2017 Tax Cuts and Jobs Act was passed, theft losses are no longer deductible on Form 4684. If your cryptocurrency was stolen and classifies as a theft loss, it's unlikely that you can write this off. You can read more about the details of these rules in the IRS guidance in Pub 547, although the IRS has not made an explicit ruling on this topic.
Cryptotrader.tax has an interesting discussion of crypto losses in general.
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