{
  "manageEntity": {
    "action": "Save",
    "entityId": "553651",
    "entityType": "Track",
    "nonce": "0x08c907a7131acde5ad9047f0de6f986db570b5c2b61645bb313fbd8016912996",
    "signature": "0x3033aefbd96b802bb85ba4bd6e9ad8d37a8a8465b0d6b24c6474317971e1465d437f6f2685febe5d8e3e8fe079389cfb56d6b573d0877f564e90f7ffd975767d1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}