I bought passes from a friend/scalper/third party. How can I verify that they're valid?

Only passes purchased through Firefly’s official ticketing partners can be guaranteed as valid.

Do not buy passes from an unauthorized third party or scalper. We will not offer customer service, authentication or support for passes purchased through unauthorized third parties. You will only know that your third party pass is valid when it successfully scans into the venue EACH day. Registering a wristband does not guarantee the wristband is (or will remain) valid for all festival days.

Scalped passes are subject to cancellation at any time without warning.