Sign the data using keys.
The request is successful.
{- "data": "0xf4075c4ac711519c7091365cf6a644dc432cc03d9dd8c506daf1bb565e7e4f9d"
}
{- "signedData": "0x8773fde52e863ee62c2656c401044d50ecf584dd64bd245d15c2e3c40cb67bed268652bdd44edfd7183f32810fd47a4c930ff18f9858629a031a44b6ddf0674801"
}