> The supporter could ask bank to mail him a receipt from the transfer. And then show this transfer or have it notarized in most extreme case. Thus proofing he made it. We already have solutions for this.
No one will believe the supporter. The receipt may be a fake text he/she made.
The whole premise of blockchain is that no transaction can be altered. What happened -- happened, unlike someone's text or screenshots on someone's servers on the Internet.
No one will believe the supporter. The receipt may be a fake text he/she made.