{
  "manageEntity": {
    "action": "Save",
    "entityId": "2019871351",
    "entityType": "Track",
    "nonce": "0x66b705b0ffa9173b3c0093e748883e05bb86b56826c2636b95a853374becd809",
    "signature": "0xc142c8084231e254698a4e069523281985229a7878a6f10adcd460908541cb45533e3f0900dd60a4840422b310a0be4a28da4586836cab7755adfc4d8892cc7f1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}