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Threats to Altcoins and Small or Private Blockchains | CoinPressAside from the classic Denial-of-Service attacks or bugs that haven't yet been discovered, the very nature of Ethereum and blockchain in general make it susceptible to a few methods of subversion, especially when you've made your own altcoin on your own blockchain and your mining pool hashrate is still on the small side.
Common Problems Setting Up a Private Ethereum BlockchainThere's not a lot of documentation on getting private blockchains working other than some very basic setup guides. There's very little troubleshooting information out there for what to do when suddenly your client won't mine, or when adding a peer returns true, but the peer never actually adds and you have no idea why.