The memory contains {HEAD ~ a shadow ledger} of {TAIL ~ transaction history} related to the independent ledger of transaction history stored on a remote communications unit 
The memory contains { HEAD ~ a shadow ledger } of { TAIL ~ transaction history } related to the independent ledger of transaction history stored on a remote communications unit
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH