<p><img src="https://images.cointelegraph.com/images/840_aHR0cHM6Ly9zMy5jb2ludGVsZWdyYXBoLmNvbS91cGxvYWRzLzIwMjMtMDMvYzEwYzBjMWMtMjNmYi00NWIxLWFiNTgtZjMxNzhjMzlmMTA0LmpwZw==.jpg"></p><p>Bitcoin's old 2017 all-time high is still a key level when it comes to long-term investment, data shows.</p>