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I don't think there is a single answer to the best use. The thing is that the blockchain can be used to solve all sort of problems that require trust, and you could essentially remove the element of trust from any transaction. The biggest causes would be things that requires middle-men these days, that could instead be solved by a smart-contract.

blockchain provides smart contract, cloud storage so that you can store the data of millions of yeas and financial services , and also you get digital identity with which you never need to worry about security.

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