When Fox News’ Megyn Kelly confronted Donna Brazile over a Wikileaks email that shows the interim DNC chair giving Hillary Clinton the exact wording to a question before a town hall event, Brazile claimed the emails were doctored. But now, one tech blogger says it’s quite easy to prove they weren’t.

Tech blog Errata Security took up the challenge, finding the email Brazile sent to campaign adviser Jennifer Palmieri and ran it through a verification program.

DomainKeys Identified Mail (DKIM) is a system employed by many email servers, including HillaryClinton.com, to verify emails to recipients and avoid spam filters. The system sends a DKIM "key" to the receiver to verify the sender and confirm the email hasn’t been tampered with. Consequently, bloggers ran the DKIM keys included in this and other emails through verification software, which in turn validated the Palmieri email as both real and undoctored.

Cybersecurity expert Robert Graham detailed the process in his post for Errata Security and told Fox News the validation “took less than five minutes.”

Graham is so confident the verification program is accurate that he’s offering a $600 BitCoin challenge to anyone who can doctor an email and still have it show as verified after running through DKIM software.