Fixed blockchain bugs
Fixed blockchain bugs

vaporry/pyethereum,shahankhatch/pyethereum,ethereum/pyethereum,ethermarket/pyethereum,ethereum/pyethereum,shahankhatch/pyethereum,ckeenan/pyethereum,pipermerriam/pyethereum,harlantwood/pyethereum,ddworken/pyethereum,karlfloersch/pyethereum,karlfloersch/pyethereum,pipermerriam/pyethereum,inzem77/pyethereum,holiman/pyethereum