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