pub trait BlockSigner: Send + Sync {
// Required methods
fn seal_block<'life0, 'life1, 'async_trait>(
&'life0 self,
block: &'life1 Block,
) -> Pin<Box<dyn Future<Output = Result<Consensus>> + Send + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait;
fn is_available(&self) -> bool;
}