If your cryptocurrency was stolen and classified as a theft loss, you do not report it and you can not take the theft as a loss on your tax return. After the 2017 Tax Cuts and Jobs Act was passed, theft losses are no longer deductible on Form 4684. You can read more about the details of these rules in the IRS guidance in Pub 547, however, the IRS has not made a specific ruling on this topic.
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