I'm just going to put this out there since every altcoin scammer is piling on this topic to try to pump their shit: 
 
If there are ANY of the following words associated with an altcoin, it is shit-tier: 
 
- presale
- IPO
- proof-of-[anything but work] 
- staking
- affiliate
- masternode
- pump 
- interest 
- shares 
 

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So far the only valid 'proof' discovered that can scale economically is proof-of-work.  Proof-of-stake is flawed for a currency until further notice.