A former sound engineer for award-winning rapper Eminem—also known as Marshall Mathers—was charged on Wednesday with stealing the rapper’s unreleased music and selling it for Bitcoin, according to federal prosecutors.

Rapper Eminem said "significant damage was caused" and his team is "appreciative" after his former longtime employee was charged with leaking his unreleased music online.

An ex-sound engineer who used to work for Eminem for 14 years was charged on Wednesday in connection with allegedly leaking and selling more than 25 unreleased songs in January.