Bitcoin is the king of cryptocurrencies. It is the No.1 cryptocurrency according to Coinmarketcap. Bitcoin will not let go of its position. It is good to hold Bitcoin for long term benefits.
There are several Altcoins which are potential coins like Ethereum, XRP, Stellar, Binance coin, Litecoin, Monero, Tron etc. These are the best cryptocurrencies for long-term investment.
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nxt btc exchange will give 0.000006 BTC. One can convert at the best rate at leading exchanges like Coinswitch, Binance, Changelly etc.