<p class="MsoNormal">Trading volumes at major cryptocurrency exchanges declined by over 40% in June, according to data released by London-based researcher CryptoCompare. The decline is attributed to the intensified Chinese crackdown on cryptocurrency trading and mining combined with the slump in prices and lower volatility. While spot trading volumes declined by 42.7% to $2.7 trillion, total derivative volumes fell 40.7% in June to $3.2 trillion. </p>