{
  "manageEntity": {
    "action": "Save",
    "entityId": "742165798",
    "entityType": "Track",
    "nonce": "0x4008ff6f9aba469e84ebc806882c42597ff632f4ffcae4253c0317c7a783d60d",
    "signature": "0xfc7ceebcf1bc53883e5ec063510fded2b65119e9ad015e8f58c97371a98e5c0716fa3da8127ccfbe52b6fbb57c167392c6f5cb1d73a4ee4dea8741cfcc584e301c",
    "signer": "0x14FF2Ce3bf23AEeC9C140996251F6f85D8e99431",
    "userId": "53273933"
  }
}