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That's where SDC true potential lies IMO....it being a truly untraceable currency. <---- could have big implications
Interesting point.
So, SDC vs. XMR.
What's the difference and is SDC a potential threat to XMR?
Ignoring the market and the GUI.
Is it simply PoS vs. PoW?
PoS vs. PoW
Codebase is another difference (Bitcoin vs. CryptoNote)
Multisig and Smart Contracts (think OP_CHECKLOCKTIMEVERIFY)
Public and Private (think of it as CreditCard (leaves trail) and Cash (no real trail))
Shadows Ring Signatures (latest) are almost 50% more efficient ("1-out-of-n Signatures from a Variety of Keys" by Abe, Ohkubo and Suzuki) as the signature is 3+n values vs 2+2n values.
P2P Messaging aka ShadowChat
Potential Threat? of-course and not just XMR but any crypto-currency which provides (whether by cryptographic proof or not) a privacy solution. Healthy competition is good to breed innovation and progress.
Privacy based transactions alone are not going to get you a substantial user-base; users need something else tangible and I genuinely believe a market place which brings together a solution were users can trade, chat and commerce will bridge that gap. Move out of the speculation phase and into some real world uses.
At the end of the day I see no reason why both cannot co-exist and I think we will; some of the chaps I have spoken to over at XMR are genuinely nice guys working on the same privacy goals we are.
PoS is going to be huge. The mad dash for hash is sustainable when you can pay for your equipment within a few months, but once that is over the only people who will be interested in putting that much hash on the network will be those with nefarious intentions. I don't see any coin including BTC being able to survive a pure PoW system in the long term.