An index fund is a type of mutual fund with a portfolio constructed to match or track the components of a market index. 

An index mutual fund is said to provide broad market exposure, low operating expenses and low portfolio turnover.

Indexing is a passive form of fund management that has been successful in outperforming most actively managed mutual funds. 

The BitFund Balanced 10 Portfolio tracks the top 10 cryptocurrencies by market capitalisation similarly to the S&P500 stock market index which tracks the market capitalizations of 500 largest companies.

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