Step 1: Go to performance page
From your River homepage, click on "Performance" in the left sidebar to get to your performance page.
Step 2: Scroll to unknown lots
Scroll to the bottom of the screen to the "Unknown Lots" section and click “Add Cost Basis” for the deposited lot.
Step 3: Enter lot information
Enter the Date of Acquisition for the tax lot, the Quantity of Bitcoin, and the Cost Basis (including fees). If the deposited amount was the sum of multiple Bitcoin acquisitions, you can break up your deposit into multiple Tax Lots by clicking "Add Row".
Step 4: Update lot
Once all the details have been added, click “Update” to save your changes. Once this is done, every tax lot you specified will now appear as a Known Lot. If you wish to edit this information in the future, you can click on one of the tax lots associated with the deposit and click "Edit Cost Basis" to revise the details.