{
  "manageEntity": {
    "action": "Save",
    "entityId": "509254",
    "entityType": "Track",
    "nonce": "0xaf2e8c219ee617effd726ea8f50b1fbf030a18c890d215666b208e07894fea6d",
    "signature": "0x54f1975102349c669e216d3d8ecfcbdda7f30310849d7780975cd57e23ab831f17a5790cf788c3601a29cd782788b63756ebda81c34f9b9b55a55fc0d129fd351b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}