{
  "manageEntity": {
    "action": "Save",
    "entityId": "488842021",
    "entityType": "Track",
    "nonce": "0xcb3e43552f421b890aff6b14586d22d7f4d9b57f920083b4298a8e8bc4c08009",
    "signature": "0xdcd379ee46a55396186d267e06bf355bb02d30026c600d5db13b514eff3f249b5daeeee9f42243eeb3ce630a37ff371c42dead2f812874f283428c52692ae6811b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}