{
  "manageEntity": {
    "action": "Save",
    "entityId": "1973044862",
    "entityType": "Track",
    "nonce": "0xe9b2c57baabd53daeceb57ce9022afa6ecf5a44d3ee0161e3720a7e37a29f573",
    "signature": "0x30b77e3710e5f861468796d736a403df18d0598b44db4a071adb5cc0ad8c492b3d3c2a57894305766c0f7f8062e8258adf1a63c74d7f77a642ac8136897c1f111c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}