{
  "manageEntity": {
    "action": "Save",
    "entityId": "680970690",
    "entityType": "Track",
    "nonce": "0x21b622fe71f0c15aadcd690a1ff0c02b0a3423f5daea59aa97731127bcfed580",
    "signature": "0x6eba8e8870a88d2a4b1a8ab0962827ec0e8be5a67be41ca57d62cc9dcc90c7ee79e2547f1c312f45f51192f590876ac411bd6dc21b5d887c020c54e81b9d7f101c",
    "signer": "0x019ff76C6e9072A7b7ee22fC684b4B989b8ea3b5",
    "userId": "775276681"
  }
}