GC threatening mechanic's liens but he signed a release of lien

[Dan Krupa]

Hey BP. I had a subpar GC. Late on work, not paying his guys, etc... I fired him and paid his guys myself. I have kept detailed notes, payment receipts for all draws, photographs, the scope of work, our contract, and I had him sign a release of lien waiver.

After I fired him I calculated the amount paid and the work completed to date. With late penalties, he technically owed me $12, which I waived. I sent him all of my documentation and he responded saying he was going to the city to put a mechanic's lien on my property.

I have the release of lien waiver and all my documentation. Is there anything else I should do proactively to protect myself and prevent the lien from occurring? Or is this simply a situation where I have to wait and see if he applies for a mechanics lien and then fight it?

Thanks, everyone in advance for any help you can provide.