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time will tell so far pow looks to be more secure with iota and nem loosing millions of dollars a safer bet is with pow but bitcoin has serious issues with transactions and the fees .. miners are aware of this and are converting to altcoins .. even proof of stake. I think as the proof of stake coins progress it will be more secure for now diversification is key ! as you saw in the article I have cloud mining production that is locked in for this year but those profits I am investing in proof of stake. With high volume pos coins I don't see that much of a risk of manipulation
thank you for your question

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