{
  "manageEntity": {
    "action": "Save",
    "entityId": "1404555171",
    "entityType": "Track",
    "nonce": "0x40e5c872a4c6535fc215f8ad4ab6c68fa1641d33b8bede0079c051265cf6da7a",
    "signature": "0xdf1ce0e2986e9c8e9a4a69bba1b5a9daf26a635b3c7a1e08840ad1e948142b293f11ca787348479ad4b7877012c28c37df774204bc83c5004ce41a7bc41ddb201c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}