{
  "manageEntity": {
    "action": "Save",
    "entityId": "644318640",
    "entityType": "Track",
    "nonce": "0x7208f3c95b6ded66e9659c375c5c3f96406579bc2d2f77de1a996c5d2d2b4f59",
    "signature": "0xed5e3aaabb68898bf1413ad164f94fe47db42deef088123b023a4dbd35968c1a29a8d01e43688ac1d98b6c899f28410f3e6e083674a0edfc4c0d3c78713bb6c71c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}