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