Site: bitkonan.com
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Founded in 2011, Paymium describes itself as the first Bitcoin exchange in Europe. It is registered in France as a SAS company and operates as a Bitcoin trading platform. 
Buybitcoinsmart helps users find the best exchange to buy bitcoin. Simply pick your country and you will find the top exchanges in your location. Are you new to crypto? Check out the guides to learn how to store your coins safely, how wallets work, how to detect & avoid crypto scams, and much more.
Kryptono is a centralized cryptocurrency exchange incorporated under  the law of Singapore. The KNOW token is the platform’s utility token.