Function content_procedure_bound 

pub fn content_procedure_bound(procedure: &str, node: &[u8; 32]) -> bool

Whether procedure is node’s content procedure: ~<node>/content_v1, or <org>/content_v1_<node> under an org that is not empty, _, nor a ~ namespace, each node as 64 lowercase hex, so an announcement cannot point a fetch at another node’s procedure.