You are correct. Your cost basis in ETH is $42,000. Your sales price will be $0.
Stocks, stock rights, and bonds (other than those held for sale by a securities dealer) that became completely worthless during the tax year are treated as though they were sold on the last day of the tax year.
A stock may become worthless when the corporation files for bankruptcy, stops doing business, and has no assets. Financial difficulties will not make a company's stock worthless unless there's no hope that the company will survive. Worthless stock includes abandoned stock, permanently surrendered for no consideration.
Stocks that become wholly worthless during the tax year are treated as though they were sold on the last day of the year.
Enter a worthless stock like any stock sale but with a sales price of zero and the word worthless in its description.
See IRS Publication 550 Investment Income and Expenses, page 54.
Follow the excellent advice of @DawnC above.
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