{
  "manageEntity": {
    "action": "Save",
    "entityId": "709503402",
    "entityType": "Track",
    "nonce": "0x39dee9135f555f378be6667571e30d9c63a720f24e0bccc40c95f4a27ae70d68",
    "signature": "0x0c5639fef28639f6b7b38dca5e77e4fca7ac409d6ad6d95be680edb4c91999407e8f9acbbfaf11897724dd8d5aacc22a261d931db7e531531930c384f367bb4d1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}