{
  "manageEntity": {
    "action": "Save",
    "entityId": "551822",
    "entityType": "Track",
    "nonce": "0xbb544bebab9121c9daf03afdb43f2b20fbaf31c89edcff549f99d9d178868a10",
    "signature": "0x1b396ec451bf451390f60c1ddcba8dea89e888951219b6acb7feba485a76315e148c0865076a570536e97d98c7a8bf46468f65790aba41dbd3ff77c63edefeee1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}