{
  "manageEntity": {
    "action": "Save",
    "entityId": "709803",
    "entityType": "Track",
    "nonce": "0x6dc23c7cb3bb03497852e43afb073ff480502cc40c691572e35e793bd24d732d",
    "signature": "0x444f265b35f1fa168c2502c8f29e525c2539adb52d323d4bc523c7fd549ac5410822681275de489e0bc6b2a44d2b6f8c8123a473e9f48c71a28ca96a24c910541c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}