{
  "manageEntity": {
    "action": "Save",
    "entityId": "257977",
    "entityType": "Track",
    "nonce": "0x1f6d8eb2ad20f368ed6c6bc0872711b0d409054de1a755fe85f69fc1213032fa",
    "signature": "0xe794dc675203b0f7e07b9c4f40ef8b3a529817eb2723efa24ab7404eda9c463c7ef28e4f409dd8608526c9a9c8f894b6fa3d1878f6b654fc402e370a1d8346301c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}