The system includes communications electronics adapted to provide radio communication with remote communications units, which are capable of maintaining {HEAD ~ an independent ledger} of {TAIL ~ transaction history} 
of
The system includes communications electronics adapted to provide radio communication with remote communications units , which are capable of maintaining { HEAD ~ an independent ledger } of { TAIL ~ transaction history }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL