A new cryptocurrency index from S&P Dow Jones Indices and Pantera Capital is taking a distinctly Wall Street approach to digital assets—and that means leaving Bitcoin (CRYPTO: BTC) out. Cathy Clay, CEO of S&P Dow Jones Indices, told CNBC on Wednesday that the company is applying the same broad principles used in its equity benchmarks to digital assets. Operating history, revenue generation, liquidity and listing status are some key criteria for index inclusion.