NASDAQ is the second largest stock market globally by market capitalization, is to start offering investors Bitcoin and Ethereum indices which are being seen by some as a sign to allow traditional investors to participate in Cryptocurrencies.

NASDAQ has announced that both indices are calculated using data from multiple cryptocurrency exchanges “to provide a single price point for BTC and ETH. The BLX is one of the most widely-referenced BTC indices among crypto traders and has been calculated back to 2010. Likewise, the ELX has been calculated back to 2014.” 

Nasdaq will be basing the prices from 50 bitcoin sources globally which are considerably higher than other exchanges like CBOE and CME Group.
https://news.bitcoin.com/nasdaq-stock-exchange-...h-indices/