It has been said sometimes that a Bitcoin transaction can be cancelled or reversed using for example double-spend.
Is it still possible? If Yes, how? If No, Why?
Especially when you sell services and goods and accept Bitcoin payment, you are worried about this.
So it should be a good idea to discuss this topic.
That's not able to do, and also this is also the deficiency about bitcoin transaction.
The verification of doing transaction is still lack and hope it will improve in the future