{
  "manageEntity": {
    "action": "Save",
    "entityId": "90354974",
    "entityType": "Track",
    "nonce": "0x2b57a751ab6d9916f0e1066ff1415d7ddf180bba2f7872d048443709122e96f7",
    "signature": "0x4491ea1d12323022969a542dbc43dcfeff8c4e3c164c87208d825bd2e9979e2720032f5005977523e6139122f82e408d28e6dc6e9d65cc6bd335dc12298d66b81c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}