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There are many trading sites like mercatox , bitgrail , BTC_Alpha , bitxchange etc where we can easily sell  and buy the cryptocurrencies. But the real trading of coins in mainstream is still a challenge due to high fluctuation and numerous coins in the market 
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<b> But now the company that runs Switzerland’s stock exchanges might  support the trading of cryptos and other digital currencies.<b>
<h1>Possibilities and advantages</h1>
Some posibilities and advantaes if the cryptos are enllisted in the stock exchanges are:
>Tokenizing the world would  be swarming with investors  as it has maximum fluctuations and has high profit.
> It is blind investment where no one couuld guess  what is in the next cup.
>Reguatory framework and central  exchange would provide best outlet and framework to currencies  .
>Transparent , accountable , fair trade in crypto world  .
> Can act as the institutional capital as well.
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<h1> Challenges</h1>
Some challenges for cryptocurrencies to be in stock market are,
Some asian , european countries are still banding cryptos.
  Downfall of the cryptocurrencies.
Stealing , hacking of the new cryptocurrencies.
Most of the exchangers /investors are still  unknown about the crypto world.

They were some challenges , advantages and possibilities of the crypto currencies in stock exchange.The <b>SIX Group</b> announced that it would possibly  launch a digital trading platform next year and while it hasn’t officially declared support for cryptocurrencies  . Lets hope for the best.