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August 13, 2014, 12:25:01 PM |
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Well, no more or less than any other coin I'd imagine, really. If it was PoS you'd have control of the blockchain, essentially. If it's PoW, then like any other coin, you might get a few different blockchains to begin with until the longest blockchain is determined, then that would become the official blockchain. Like any other coin, it is at risk of 51% hashpower attack, which could fork the blockchain.
How many coins you've mined already shouldn't change the way blockchain propagation works.
The original PMC (Premine) was 100% premined, and didn't have any problems with security, except for the fact that it was SHA-256, and so vulnerable to someone with enough ASIC power to do a 51% hashrate attack on the network.
PMP (PreminePlus) is 100% premined, but PoS, and a lot of the coins have already been distributed. Only someone with 51% of the total supply of coins could attack the network, and I think only 50% exist while the other 50% are stake coins, so it's unlikely.
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