I created an ethereum paper wallet on an offline computer. Do I need to keep both the private key and the UTC/json file or can I just keep the UTC/json file and extract the private key from it. Thank you.

  • Note: If you forget your password, no one can do anything. It would be better if you keep your private key as your backup option. – Ayushya Mar 5 '18 at 7:18

The JSON file contains (in encrypted form) the private key, so that's all you need.

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