I see small monthly proceeds from my Ethereum crypto currency but I did not sell any. Why is there a sold date?

Yes, something sold. You should contact Ethereum or look on their website to find out more information about what was sold.

The IRS instructions for Form 1099-B describe Box 1d:

Box 1d. Proceeds

Enter the gross cash proceeds from all dispositions (including short sales) of securities, commodities, options, securities futures contracts, or forward contracts. Show a loss, such as one from a closing transaction on a written option or forward contract, as a negative amount by enclosing it in parentheses.

You must reduce the proceeds by commissions and transfer taxes related to the sale. For securities sold because of the exercise of an option granted or acquired before 2014, you may, but are not required to, take into account option premiums in determining gross proceeds if that is consistent with your books. For securities sold because of the exercise of an option granted after 2013 or for the treatment of an option granted or acquired after 2013, see Regulations section 1.6045-1(m) for details.

If you reduce gross proceeds by option premiums, check the second box in box 6. Otherwise, check the first box.

Do not include amounts shown in boxes 8 through 11.

If identical stock is sold at separate times on the same calendar day by a single trade order and a single confirmation is given that reports to the customer an aggregate price or an average price per share, you can determine gross proceeds by averaging the proceeds for each share. However, do not do this if the customer notifies you in writing of an intent to determine the proceeds from the sale by the actual proceeds per share and you receive that notification by January 15 of the calendar year following the year of the sale. You may extend the January 15 deadline but not beyond the due date for filing Form 1099-B.

Do not include any accrued qualified stated interest on bonds sold between payment dates (or on a payment date) in this box. Instead, report this accrued interest on Form 1099-INT.

For reporting an acquisition of control or substantial change in capital structure, see Acquisition of control or substantial change in capital structure, earlier.