Do the buyer and the seller in a smart contract have to OK the deal by using a digital signature or just by confirming it through a button?
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I think this is at your own discretion to decide on ... It's formality and u decide how u want both parties to transact whether be it through digital signature or a click of a button ... That's a procedural step that you decide how to design ... Either way it will work as you want it to ...
Whatever you want. It's going to be your thing. Nothing HAS to be this way or that way. It's totally unregulated. A simple BUY button will suffice. If you want to complicate things, you can make them sign a contract before buying a single token - up to you.