{
  "manageEntity": {
    "action": "Save",
    "entityId": "306545",
    "entityType": "Track",
    "nonce": "0x061f9e8efa0f2e2cd5a24b930b1564df6d394de46d498028412c8ca21490782a",
    "signature": "0xb96822545d946fb70e0b98fe7c2df1c75acef71d2219eb9fd098b6f3add45da443a43c1563f0248d5d7e237ec5e894ba36984896e45d202dd66f254579bee9661b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}