Today's blockchain and cryptocurrency news Bitcoin is down 1% at $8,159 XRP is up 1.5% at 25 cents and Ethereum is down 1% at $174 Top gainers in the last 24 hours: Centrality up 103% Dentacoin up 15% Venture capital institution Andreessen Horowitz is launching a crypto startup school. Tim Cook says Apple has no plans to launch a cryptocurrency. US lawmakers are looking once again to hear from Mark Zuckerberg. PayPal may pull out of the founding group of Libra Association.