Update the protocol spec to describe some possible error scenarios
Update the protocol spec to describe some possible error scenarios

misaakidis/ceno,misaakidis/ceno,misaakidis/ceno,misaakidis/ceno,equalitie/ceno,equalitie/ceno,equalitie/ceno,equalitie/ceno,equalitie/ceno,misaakidis/ceno,misaakidis/ceno,equalitie/ceno