Use your iOs device as part of a Bitcoin multi-signature setup.
brew install gnu-sed
Install Ruby, e.g. using RBenv and Cocoapods:
rbenv install `cat .ruby-version` gem install cocoapods pod install --verbose
To preview documentation:
bundle exec jekyll server --incremental --source docs
To get the simulator working directory, export your public key in Settings. The path is printed in the log.