Fans who purchased tickets when they went on sale will have to arrive at their gig venue with the booking confirmation, a valid form of ID and the credit card used for the purchase (or a photocopy).
How are the bouncers on the door at an Ed Sheeran concert supposed to tell a real Portuguese fishing licence from a fake one? And what happens if I use my credit card to buy a ticket as a present for someone?
There is a solution, of course: put the tickets on a shared ledger and then sell them on eBay so that the market clears. If Ed wants fans to have tickets for £10 instead of £100, then he can buy the £100 tickets in the auction and re-sell them himself using whatever identification and authentication system he wants. Ticket “scalping” is a natural response to a broken market.