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You might see this smart contract things by the end of next year as I have heard many things about this and I am sure it will be seen very soon.Btc are already used as payment option and many other coins are being used but not with full conviction.
I like the idea of a smart contract, you create the smart contract test it and then it can work on it's own, more of like a robot for businesses. I hope we have that option on bitcoin too. It will be a great feature.