TMZ just received a third email from the man who claims he knows the identity of Nancy Guthrie‘s kidnapper … and he has upped his price.

The email says he’s contacting TMZ because he doesn’t trust law enforcement. He’s essentially using TMZ as an intermediary, telling authorities — you don’t trust me, and I don’t trust you.

He suggests the reward being doubled to $100,000 was a move designed “to discredit me.”

As we reported, the man demanded 1 bitcoin to give up the name and location of the kidnapper. That 1 bitcoin — currently worth around $68,000.

Now he wants that $100,000 FBI reward, and here’s how. He’s asking for a fraction of bitcoin worth $50,000, and in return, he will give up the information, and then he expects another $50,000 in bitcoin. He promises not to withdraw the first $50K until the kidnapper is arrested.

There’s another important change … he says when he gets the initial payment, he’ll give up “the name of the main individual.” Referring to the “main individual” clearly suggests there are accomplices.