Sign a message using the private key for the address 1MDq7zyLw6oKichbFiDDZ3aaK59byc6CT8 in order to prove you own it.
Or, you are a scammer.
Or, you are a scammer.
Here proof
https://imgur.com/27sYlMi
It does not prove anything, sign a message is the valid proof that you owns the address which contains of 9,000k BTC
Most of transactions to above address were made last year. Why you did not sell it since the first big transaction?
I think if you think like that you'll never know if it's true or not because every bitcoin address is not related to a face and as long as you do not try it you can not know if it's true or not so to you to see. Thank you !