{
  "manageEntity": {
    "action": "Save",
    "entityId": "435699",
    "entityType": "Track",
    "nonce": "0xafd32abc645ea5e81761781dbfb63f5bda6872356e68de617aad7867fe464740",
    "signature": "0x3e2954a2e085999263dcd702462777164653414b4cb6b10f4614137329961e3613257a669aa527a2f1412ac1309629dcfd8a5c821413cc43408cacdefe1182a41c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}