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