{
  "manageEntity": {
    "action": "Save",
    "entityId": "455082",
    "entityType": "Track",
    "nonce": "0x3d62bd3fe7a8baa0b7f57973b23e9ccbee6cb893cc7a0d92f1a93e556c2590af",
    "signature": "0x229c328efb2df5015353e574a05867bd9b25f5c1b6f914d786ee647243fd476a2ca6e7aafd557a461d855ec097ef82062d181bbef9a85f05dd4ea93cf90085a21c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}