{
  "manageEntity": {
    "action": "Save",
    "entityId": "750415874",
    "entityType": "Track",
    "nonce": "0x8eff6c5be2cd39c65f3db61d2b860d6fcdf081cf879d484bbc75b56130818a4e",
    "signature": "0xf557ffd055a84b2ab30d6a628a3873aa0697944a28d2a9b6567840dfab7d744a2af0e9c5e380aaba15e3274006ec8f99ddccf2656f7678870ecec7325e88e5cd1c",
    "signer": "0x98fC2b30E6e70e62dB2b5fAE7b0292DE3D4323Bf",
    "userId": "480962013"
  }
}