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As the Cardano mainnet, will the Cardano testnet be maintained indefinitely and immutably or it will perish at some point in time?
No, there are plans to reset the testnet in the future, probably sometime after Goguen.
But it is immutable forever, if you keep the blockchain data.
Well, we can assume that it will be maintained indefinetely because Cardano will also will be under development.
In the same way as in system administration you have Dev, Staging and Production environments in Cardano we also need to have testnet before pushing that in mainnet.
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