Tillman released a statement of how his involvement came about. He wrote:
About a year and half ago, my friend Emile Haynie played Beyonce some of my music, along with some tunes I've written for other people, back when she was looking for collaborators for the record...Pretty soon after they sent along the demo for "Hold Up", which was just like a minute of the sample and the hook. I'm pretty sure they were just looking for lyrics, but I went crazy and recorded a verse melody and refrain too that, unbelievably - when you consider how ridiculous my voice sounds on the demo - ended up making the record - right between picking up the baseball bat and decapitating the fire hydrant.
I was mostly kind of in the dark, my involvement with the record kind of ends with me just sending off the demo, it wasn't until she came to my Coachella set in 2015 and told me personally it had made the record that I really had anything concrete with which to convince my friends that I hadn't actually gone insane.
Earlier in the day, Tillman also gave a funny and fictitious account of the story on Twitter. Read his tweets below.