{
  "manageEntity": {
    "action": "Save",
    "entityId": "919433",
    "entityType": "Track",
    "nonce": "0x4dfb37e63f8e6f05bb4fcfb54745a56f4868b8c62650deceddb38d7913968b8c",
    "signature": "0x512384b112c5bb763ac122173e2a6cba70f892911176f8c59ccc4ff8edae44966a607a9fe9c136bb61c9abb97d4e50fca03810cd909c4140ff635c977991b7921b",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}