{
  "manageEntity": {
    "action": "Save",
    "entityId": "504616410",
    "entityType": "Track",
    "nonce": "0x309babfb988db4c56213ddc2fd81b75bb927afa519697cdfd871bb554065a47f",
    "signature": "0x42cc23b443596e3a0e88b7aa7eef893378b9b553ad1410a298012200cbe9bfe32283259aa30ec22f48224d7b3d07455278547e67bd646ac5d7d0d4357d4b66e51b",
    "signer": "0xC7f1C5c105933bBdAC0c8A3219204f23AD4f3320",
    "userId": "381638009"
  }
}