{
  "manageEntity": {
    "action": "Save",
    "entityId": "1907448598",
    "entityType": "Track",
    "nonce": "0x709ba9c7b2a2ab73013de6c58b7e3f541217d29ca30f0db0e768f5238f5c99fd",
    "signature": "0xa214b66af327b7102411b9fffc021008fe8c1e478c4786932d224207393457346482fd1f3f64125b63e6fee7b7ad987350cafa60d5aa0899b4fe74c96caf8f3b1b",
    "signer": "0xd1bC12b8b46f2FAa152aB791052b4a26826F86F5",
    "userId": "481080235"
  }
}