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Saving data on ledger

abdelhalem.salah@...
 

i want to know what should i do if my webapplication which is lined to the a node , i want to save data on my node , and other nodes can request my node to get info for example : i will save a cheque book , and other nodes will contact me to check if the cheque book serial is already exist , how could i implement this requirment in corda ?