I think there should be a button to cancel transactions, past 5th Dan Black Belt as I got scammed 381K The other day that's how this idea came around

Well, say you make a transaction, then the TC is immediately used or sent to various other accounts? They have Safetrades for a reason when you want to make risky transactions like 381k. Only thing I can say is be aware, take screenshots, post a scam report and let people capable of handling it try to help you

Once you've made the transaction. You have sent your TC or Item. You are taking a risk on doing so. If you're ever doing this, take a screen shot of the conversation, and the fact that you sent it to them. If you're scammed and they don't send their item or TC, file a scam report and show them the screen shots. They'll make a deal on the matter of what to do from there.