You are responsible for tracking your cryptocurrency purchases, sales, exchanges, air drops, and forks. Coinbase is not required to track and provide anything other than your sales proceeds. In order to file an accurate tax return you will need to research your cost basis for each taxable transaction and report it. Going forward, there are services that will track the information for you. You provide them a link to your Coinbase (or other) account, and they track cost basis, gains, losses, etc.
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