Data offchain or onchain
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By default, for personal, your data will be on blockchain
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Of course, you could choose offchain, on our Get started page settings -> onchain , switch it to OFF, then signup your account, your data will be offchain, only in our central server not on blockchain. After you login, you could see this flag in Settings -> Profile
This feature will be on our coming v1.1.0 version
The security of your data has nothing to do with this.