The system operator will most likely determine the type of {TAIL ~ information} to be kept on {HEAD ~ the shadow ledger} 
The system operator will most likely determine the type of { TAIL ~ information } to be kept on { HEAD ~ the shadow ledger }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD