{
  "manageEntity": {
    "action": "Save",
    "entityId": "538625366",
    "entityType": "Track",
    "nonce": "0x3df0034bdce1c273e9e5d2e48800d33dbffdf6122b921f7d85aff2de26d544eb",
    "signature": "0x3099de18f15993a6feb69697ccf1f6a8050b174b0080f9839f3b9537766e00e54f4c1435007a0ff85dc5ab63bc042b6df43d6be26d1fc206b0f907688289a2ec1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}