cosmos-sdk
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Optimint: use PrivValidatorKey indead of NodeKey
Currently Optimint use only a single key for both P2P and block signing (see: https://github.com/celestiaorg/optimint/issues/89).
During Optimint node initialization, PrivValidatorKeyFile() should be used instead of NodeKeyFile().
@tzdybal is this issue still relevant? If yes, should it be moved to https://github.com/rollkit/cosmos-sdk?