What Blockchain is LimeWire on?

Excuse me, could you clarify something for me? I was reading about LimeWire and its relationship with blockchain technology, but I'm a bit confused. Could you please explain which blockchain LimeWire is utilizing, if any? I understand that LimeWire was primarily known for its file-sharing capabilities in the past, so I'm curious to know if there's been a shift towards blockchain integration and, if so, which one it's adopting. Thank you for your time and clarification.