1st Bitcoin
(not considering tenebrix, solidcoin, etc)
(2nd) Namecoin  was not born to be a coin, but a free domain system
2nd Ixcoin: it is mined with Bitcoin (merge mining), using almost zero added energy, with potential high security.  580800 ixc premined, later frozen / burned and now all 580800 ixc under re-mining


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Whay would that make it a sidechain or any different from any other turdcoin though. Any turdcoin can instamine 580800 coins and throw them at miners after the instamine which should not have been instamined in the first place. Ixcoin is a 1 cent instafail. Nobody gives a ratscat about any of the techno babble and only the bottom line. Shiw me the money is all that works in crypto. Everything else is mumbo jumbo geek circlejerky.