For calculating the gain, if your parents transfer crypto to you, their cost (basis) in the assets becomes yours. The gain upon sale is then calculated based on those values.
You'll need to keep your own records to back up the basis.
If the value of the assets transferred to you by your parents exceeds $100,000 in aggregate over the course of the year (combined with any other gifts from your parents) using the value on the date of the transfer, then you will also need to file a Form 3520 the year following the gift. This form is filed separately from your tax return.
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