The BraveNewCoin aggregated index is chosen as the source of data for Bitcoin, Ethereum and Monero. The BraveNewCoin aggregated index is not used for Litecoin as their index for Litecoin only starts in April 2014 and misses earlier price action. Instead, Litecoin data is retrieved from the BTC-E time series. It should be noted BTC-E has recently (25th July 2017) been shut down by US authorities, however this is after the data interval examined. It has been observed that price differences do exist between cryptocurrency exchanges [19], and it is expected the BTC-E price over time will be different to other exchanges, however with the possibility of exchange arbitrage, prices on different exchanges are reasonably similar.
In the last 24 hours, Bitcoin has gained around 3 percent and is trading above $67,000. The crypto has added over 10 percent in the past week.

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Although “smart contracts” represent an important move toward addressing the lack of chargebacks and refunds in cryptocurrencies, it remains to be seen whether they’re enough to solve the problem completely. Still, they’re at least partly responsible for Ethereum’s success.