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RSK Smart Contract Platform is an open source platform for smart contracts based on the Bitcoin network. We will create a dapp inspired by Cryptokitties, a popular blockchain game where you can collect and breed digital cats. In this tutorial, instead of collecting felines in our app, we are going to collect exclusive color tokens. The most important properties for this kind of asset is to have a way to check who owns what and how to move things around. It is easy to create new ERC721-compliant contracts by importing it from the OZ library and we will do so in this tutorial.