* Response: Contains an Ethereum address derived from device private seed @end.

* Request: Ask device for Ethereum address corresponding to address_n path @start @next EthereumAddress @next Failure.

* Request: Ask device for public key corresponding to address_n path @start @next EthereumPublicKey @next Failure.

* Response: Signed message @end.

* Response: Contains public key derived from device private seed @end.

* Request: Ask device to sign message @start @next EthereumMessageSignature @next Failure.

* Request: Ask device to sign transaction All fields are optional from the protocol's point of view.

* Request: Transaction payload data.

* Response: Device asks for more data from transaction payload, or returns the signature.

* Request: Ask device to verify message @start @next Success @next Failure.