user180: As the Cardano mainnet, will the Cardano testnet be maintained indefinitely and immutably or it will perish at some point in time?

user28: 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.

180: <p>As the Cardano mainnet, will the Cardano testnet be maintained indefinitely and immutably or it will perish at some point in time?</p>
 28: <p>No, there are plans to reset the testnet in the future, probably sometime after Goguen.</p>
<p>But it is immutable forever, if you keep the blockchain data.</p>
