I could be wrong because I don't know the technical aspect of things but my guess is we really can't be 100% sure all the time.
That's why I believe reputation is important in this scenario and that's also why I don't drift too far from Hive blockchain. We all know the guys that are building things here so I find it a lot easier to trust them than some "outsider".
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There are also certificates issued by companies like Certik that provide an additional layer of trust, but in my opinion, it all comes down to reputation.
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When more people complain about a crypto, blockchain, or exchange than praise it is when we know it's a stinker to be avoided. As @tfranzini noted, it boils down to reputation.
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