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I'm new for ethereum. I downloaded the wallet. I found out I'm on test net. I moved to main now. I would like to delete blockchain file of test-net if it is different then main? Thanks

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Yes, the mainnet data will be different from the testnet and you will have to redownload the data. If you are using mist, then you can find the data directory at ~/Library/Ethereum on mac. Your data is stored in chaindata folder which is ~/Library/Ethereum/chaindata. So you can delete this to remove the data.

  • Why do we need testnet at all? For developers ? – lenso_here Jun 2 '17 at 5:55
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    Yes for developers, if you want to test some application before deploying it on the mainnet. – joifsi Jun 2 '17 at 5:56

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