Protocol update: Preconditions and prospects.

Just like PPCoin, NovaCoin uses ChainTrust score instead of ChainWork (used by BTC, LTC and another PoW-based systems).

We decided to implement the new chain trust score calculation algorithm. It will prevent pure PoS double-spend attacks even without broadcasted checkpoints. Now I’ll try to describe, how it works in comparison with an old algorithm.
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