Reality Shares ETF starting January 17th, 2018: http://www.businessinsider.com/bitcoin-blockchain-etf-launching-on-nasdaq-2018-1
Companies looking to create indexes following blockchain companies: http://www.businessinsider.com/blockchain-index-companies-to-bet-on-2017-11
Reality Shares' SEC filing: https://www.sec.gov/Archives/edgar/data/1573496/000114420417055803/tv478375_485apos.htm