{
  "manageEntity": {
    "action": "Save",
    "entityId": "379393910",
    "entityType": "Track",
    "nonce": "0x1cc4f81ba956775113c6a8ca3a827f9973dc2a1e61d65a834ad7b19125d3f322",
    "signature": "0xe57605851c89e843010831f7064403baee69d81cfacb46aff863a73418e98ec029ad6df3617b176e90c326ca488233fb4b6815324895f4163c6a89a03a1e59e31b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}