This decentralized procedure allows new users {HEAD ~ access} to {TAIL ~ the network} without having to physically access a centralized facility to present their credentials 
to
This decentralized procedure allows new users { HEAD ~ access } to { TAIL ~ the network } without having to physically access a centralized facility to present their credentials
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH