Kraken is in talks with firms including Fidelity, Tribe Capital and General Atlantic to raise the funds. However, if demand is as high as some suspect it will be, Kraken’s value could exceed $20 billion. That follows yesterday’s news that its larger competitor, Coinbase, filed a Form S-1 with the U.S. Securities and Exchange Commission, confirming reports that it will go public with a direct stock listing, probably on Nasdaq.