An OP Stack Chain refers to a Layer 2 blockchain that has been built using the MIT-licensed OP Stack, but has not opted in to joining the Superchain. This means OP Stack Chains won’t share security or interoperability with OP Chains in the Superchain. Since the OP Stack is MIT-licensed, and open source code is one of the fundamental values of the Optimism Collective, builders will always be able to use the OP Stack to create and deploy their own L2 blockchain.
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