{
  "manageEntity": {
    "action": "Save",
    "entityId": "618631",
    "entityType": "Track",
    "nonce": "0x73069685fe1dfa7e9000f2d18be4cff0cee6b6ce95146222fb42fdd3d8976198",
    "signature": "0x38e234dc602dea2057ee6bc7836ab25106dce467fd9622d33283b7d6887af6cd2a4855f16d00291cef886336a83a8959f14f86ac97bb78dc388b10f37c67cfdb1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}