lock when adding blocks
lock when adding blocks

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