{
  "manageEntity": {
    "action": "Save",
    "entityId": "394265680",
    "entityType": "Track",
    "nonce": "0x3dbd4fdd39e32b939aee8b3d7ab87ece745d1cb1468f0fed3f4fc8e0bcb05307",
    "signature": "0xfb5f139686e5afff08a240c9fa76840fa43ffb31fed5829e09e9dc65b3a0c1026f39591ed907ed3cd7324dffa35eccc4f245ed244b026bb22a7807c5a9441f7a1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}