{
  "manageEntity": {
    "action": "Save",
    "entityId": "640320406",
    "entityType": "Track",
    "nonce": "0xcf8b43ea0900c944e03649013aa5fd2d35b73b4e21a3e56ad78d7161f2f2c664",
    "signature": "0x96116e0a428c6f97c0a08faecae07197cd340509fe947a0ff300b72b6cd65ed146a829e255881df3be1a9bfae80ef4b79c26144e8553fc0f6fe74fedc57ec0401c",
    "signer": "0x793bbEFbb3Cf1e6529B90296e502145aCcCDE8d6",
    "userId": "838777725"
  }
}