pub trait SubscribeChain {
type Client: Subscribe;
type Header: DeserializeOwned;
// Required method
fn subscribe_finalized_heads<'life0, 'async_trait>(
&'life0 self,
) -> Pin<Box<dyn Future<Output = Result<<Self::Client as Subscribe>::Subscription<Self::Header>>> + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait;
}