:https://github.com/blockstack/blockstack-cli
:pip install --upgrade setuptools pip
:apt-get install libffi-dev
brew install libffi openssl
virtualenv -p /usr/bin/python2.7 blockstack-cli-venv
source blockstack-cli-venv/bin/activate
pip install --upgrade pip
pip install --upgrade blockstack
$ sudo pip install virtualenv
$ virtualenv /tmp/blockstack-install
$ cd /tmp/blockstack-install
$ source bin/activate
(blockstack-install) $ pip install blockstack
