Hello, I’ve started a new (free online) book(let) titled “Programming Bitcon Script Transaction (Crypto) Contracts Step-by-Step (in Ruby)”. Let’s start with building your own bitcon stack machine from zero / scratch and let’s run your own bitcon ops (operations)… Unlock the ?+2=4 puzzle on your own computer and win “unspent transaction outputs” on your own testnet. Happy bitcon scripting with ruby.