{
  "manageEntity": {
    "action": "Save",
    "entityId": "2002431818",
    "entityType": "Track",
    "nonce": "0xf90ebb9fa3f0d96841eb8464a49d38652eab8f9eb4a6afd15b9435617d3e98c6",
    "signature": "0x5a2d1608bc96400f9c8c22ce08bc26bbb0a2e9904df2cec5ea25efbc28e822014fab5bf06ec35b77b3802d8f03e0e6a4c63b57b1e5e45e7f96aa9a55ee1b99581b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}