{
  "manageEntity": {
    "action": "Save",
    "entityId": "478624705",
    "entityType": "Track",
    "nonce": "0xc562a2329cb23aa55b9efc357263353fac1ce13d296e87b6591ab40513ea6317",
    "signature": "0x03d8762dc2dc848dd2e4337037316e36d9b25a889a9f1c2d74c5458db7b6ec5078b167253eb902f040588ff3e5da6f23ca499d801f7e93ab582867058e434ebf1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}