{
  "manageEntity": {
    "action": "Save",
    "entityId": "764482922",
    "entityType": "Track",
    "nonce": "0x58c3eb5b75ced14761af5cc281202569f6820b40a0f0030940b391bd9c2b54f3",
    "signature": "0x50588d868ee5ada43d464f8fd3efb8ca9ae49bf286859f8855299e1ca9d5f07d5f38e26b25a4a0341ad4123b3f10307aec5983df01d3f5c13ae0e13fc2ef9d021c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}