Hello,
I've started a new (free online) book on github titled "Programming
Crypto Collectibiles Step-by-Step Book / Guide" [1].
Let's start with CryptoKitties & Copycats. Inside Unique Bits &
Bytes on the Blockchain...
Happy reading and programming w/ ruby. Cheers. Prost.
[1] https://github.com/cryptocopycats/programming-cryptocollectibles