{
  "manageEntity": {
    "action": "Save",
    "entityId": "619065421",
    "entityType": "Track",
    "nonce": "0x55a94e3f9238141da95f6a2c81d5e2c9c0a6468f7c818a55e72fba9da4ed0442",
    "signature": "0x393084e5706d930e349d33975f1c1f97e03468888c7f930a68f36b0b27dbf8a6716fd6bf2b69323063546e99cde4a43b28db7ebcd86f4c6289541b621ccf4d2f1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}