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