Beyonce and Jay-Z launched a new project called Greenprint through a grassroots social media campaign last night (Jan 30). The project aims to encourage the integration of plant-based foods into people’s daily diet.

Along with this encouragement, Bey adds in a challenge: try veganism for a month, provide some typeof proof, and get free Beyonce x Jay-Z concert tickets for up to 30 years.

The project’s webpage explains that Beyonce and Jay-Z are hoping to get some “field research” without an overreliance on the scientific community. “Explore and share your Greenprint. Plus, you can enter to win Beyoncé and Jay-Z concert tickets for life,” thegreenprintproject.com reads.