Hey,
I am building a simple small Bitcoin Exchange which transfers euro’s (via a Dutch payment system) to Bitcoins (via the coinbase-ruby gem) and back.
But since i’m not an expert on security, especially in combination with rails. Do you guys have some do’s and don’t?
Is it safe to run the system on an heroku server with ENV variables?
All kidding aside, web security comes down to most often user input. Remove as much user input as possible, and where you can’t white list and validate it as much as possible.