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We have a requirement where in we need to connect blockchain with NoSQL databases like DataStax graph DB. Is there any pointer for this or any high level idea of how I can achieve this

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The general approach to connecting off-chain data stores is storing a hash reference to the data item in the NoSQL DB in a blockchain transaction (in addition to the NoSQL ID or something like that). That ensures integrity of the off-chain data. In future transactions you might update that hash reference to correspond to an updated version of the NoSQL data.

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