Jamie Dimon is betting big on the technology behind 'fraud' bitcoin By: CNBC.com News October 16, 2017 at 16:05 PM EDT The largest U.S. bank is investing in the blockchain technology behind bitcoin, despite its CEO's criticism of the digital currency. Read More >> Related Stocks: Bitcoin (Bitstamp) Bitcoin Composite International Business Machines JPMorgan Chase & Co Mizuho Financial Group ADR