主要Altcoinについて加筆

[peryaudo]

• Ethreum https://github.com/ethereum/wiki/wiki/White-Paper
• Ripple https://ripple.com/files/ripple_consensus_whitepaper.pdf
• Proof of Stake vs Proof of Work http://bitfury.com/content/5-white-papers-research/pos-vs-pow-1.0.2.pdf
• Impulse http://impulse.is/impulse.pdf
• PPCoin https://peercoin.net/assets/paper/peercoin-paper.pdf
• MaidSafe http://maidsafe.net/Whitepapers/pdf/MaidSafeDistributedFileSystem.pdf
• storj https://storj.io/storj.pdf