{
  "manageEntity": {
    "action": "Save",
    "entityId": "168529",
    "entityType": "Track",
    "nonce": "0x4950d85f16a1f912faeea1888a1be12b097ec6fe1debf732d0dec4902170e047",
    "signature": "0xe811c15a882cee599297fe2cb635231f4324f1524a8202eca859f05348454e0338e787f52adea836e594de3a0b5976ae95795378b286a0b8169a90c5cdcb37401c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}