Preferably, {TAIL ~ the current transaction information} is used to update {HEAD ~ both the remote ledger} and the shadow ledger 
Preferably , { TAIL ~ the current transaction information } is used to update { HEAD ~ both the remote ledger } and the shadow ledger
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH