The best precaution you can take to ensure you are being fully compliant, and continue to be so, with your crypto currency investments is to record everything. The more sophisticated and accurate you get the better. A spreadsheet or something as simple as taking screen shots of price levels when you buy, and sell can save you from getting into trouble with tax authorities. It’s important to note that the crypto currency market is still very young and so is the regulation surrounding it. Everything is subject to change when it comes to crypto, so the more information you have to back your estimates the better.