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Yes, it's kind of a testnet, but there are differences between "traditional" Testnet and Mirrornet

It might look the same, it might feel the same, but it’s fake.
The only purpose of its existence is research and development of the Hive ecosystem.

Pretty cool, this is similar to what I have at my work, we also have a testing / mirror environment to test changes and make improvements with the security that we won't do anything stupid on the production environment bench! Thanks for sharing this with us!