The control system is adapted to receive remote ledger information from the remote communications unit relating to the independent ledger, compare corresponding information on the shadow ledger with the remote ledger information, and update the shadow ledger if {HEAD ~ the information} is different from {TAIL ~ the information} of the independent ledger 
The control system is adapted to receive remote ledger information from the remote communications unit relating to the independent ledger , compare corresponding information on the shadow ledger with the remote ledger information , and update the shadow ledger if { HEAD ~ the information } is different from { TAIL ~ the information } of the independent ledger
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