{
  "manageEntity": {
    "action": "Save",
    "entityId": "538383092",
    "entityType": "Track",
    "nonce": "0x825f3259a9166d30fc421404f916ece957b8d3b0565fac6884ea53f7efee6768",
    "signature": "0x934c60332fce34da9bad46ad11b6a3811c2a0af7ed1abf06c719b54423fba7ad773f2b291f1b18f1e35df161075f03e9d6ec09de4222ebf2c27934e03e86e4de1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}