MasterCoin Specification (AKA The Second Bitcoin Whitepaper)
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Latest version, now in github:
https://github.com/mastercoin-MSC/spec
Please do not invest in MasterCoin without first reading about the risks:
https://sites.google.com/site/2ndbtcwpaper/MasterCoinRisks.pdf
Want a simpler explanation of what I am doing? It doesn't get any simpler than memes:
https://sites.google.com/site/2ndbtcwpaper/using-memes-to-explain-bitcoin (sorry, the images appear to no longer load, but leaving this here in case I have time to fix it someday)
LOTS more information, including the current status of the project can be found here:
https://bitcointalk.org/index.php?topic=265488.0
Old Versions (pre-github)
Version 1.0, published 7/31/2013:
MasterCoin Specification 1.0 20130731.pdf
Version 0.5, published 1/6/2012:
2ndBitcoinWhitepaper vs 0.5 20120106.pdf
Version 1.1, published 9/9/2013: