The fact that he is a newbie maybe he doesn't know that thing... And maybe that's the reason why he's ignoring the suggestion, if not it is something fishy...
As for @bitmaster88 try to look at this, READ IT VERY CAREFULLY AND UNDERSTAND WHAT IT SAYS. How to Sign A Message
They do know what it is because I've already explained it to them many times. They can't sign a message because they used a service rather than a wallet. For some reason, they seem to think if they just keep on requesting the same thing over and over again they will get a different answer.
you can call Coinbase, believe me. You can also call my email services. You do not care. Mainly you earn money. It does not matter how fucking other people goes.
they only think about themselves.
And you can keep proposing things other than a Bitcoin signed message for the rest of your life without any success.
If they think I'm faking my evidence then they're wrong. I do that with my mobile.you cant fake with phone
even Coinbase can confirm that I am the right owner. If they do not want that and prefer to fool people, that's just it. I hope you get to the face that it hurts
Have you ever heard about a Sim swap? Scammers clone sim cards and they get you to reboot your phone. When you do that, they use their own cloned sim card and viola, they own your phone and can do whatever they want to.
I am also curious why you have not used the "Sign a message" option within Coinbase yet? TheQuin are 100% within his rights not to honour your request, if you have not signed the Bitcoin address, because that is standard practice on all sites, when you want to make changes.