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RE: What percentage should you invest in each cryptocurrency to become a multi-millionaire? A winning index strategy (updated 8/24/2017)
I've been using Poloniex, Kraken and Bitfinex but I don't keep my coins there. I keep them on hardware wallets. The very few I have at exchanges are not supported by any of the leading hardware wallets yet but their value is still very small so risk is minimum really