fix: tx validation and success mix-up
fix: tx validation and success mix-up

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