<p><img src="https://images.cointelegraph.com/images/840_aHR0cHM6Ly9zMy5jb2ludGVsZWdyYXBoLmNvbS91cGxvYWRzLzIwMjItMDgvMjdiOWQ5NDQtZDAwOS00ZDg2LWI2YWItNzE5MzY5Y2E3ZDc5LmpwZw==.jpg"></p><p>The study found abnormal levels of return in a sample of tokens just before their listing announcement on Coinbase. </p>