synchronize with blockchain on start
synchronize with blockchain on start

pipermerriam/pyethereum,ethereum/pyethereum,pipermerriam/pyethereum,ckeenan/pyethereum,ethers/pyethereum,ethereum/pyethereum,inzem77/pyethereum,karlfloersch/pyethereum,ddworken/pyethereum,harlantwood/pyethereum,ebuchman/daoist_protocol,jnnk/pyethereum,vaporry/pyethereum,shahankhatch/pyethereum,ebuchman/daoist_protocol,shahankhatch/pyethereum,ethermarket/pyethereum,holiman/pyethereum,karlfloersch/pyethereum