The individual also requested a payment of 1 BTC to keep this 'proof' to themselves.
Send them a PM simply asking: "
Do you know that extortion is a felony punishable by fine or imprisonment?"
I am sure it is just some kid trying to get free bitcoin not knowing what they are doing is illegal.
I expect that they know fine well it is illegal, they probably think though that the way these forums work, especially the Scam forum where people are generally guilty until proven innocent, they would be able to get some easy money as the OP would be scared into handing over the bitcoin.