At first, you can use it for less serious stuff until you see how much it works.
Technically it's not very challenging. The problem is the total dominance of a few actors and a lot of spammers.
Won't work if you need a fixed address on a business card or something, but in case you don't...
Waiting for the day they catch on. Then it's time for a challenge-response protocol I guess
At first, you can use it for less serious stuff until you see how much it works.