It depends. If you have entered your crypto sales/transactions in summaries of long and/or short term holding periods, as opposed to each transaction, and your return has been accepted, within three days you must send the following information to the IRS at the address shown below.
If you are e-filing your tax return, then mail your statements (Form 1099-B, Form 8949) along with Form 8453 to:
Internal Revenue Service
Attn: Shipping and Receiving, 0254
Receipt and Control Branch
Austin, TX 73344-0254
If you need a blank Form 8453, you can download this pdf, enter your address information and check the box for Form 8949 (this form is really just a cover sheet)
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