{
  "manageEntity": {
    "action": "Save",
    "entityId": "499585354",
    "entityType": "Track",
    "nonce": "0xb9443602bff0cc901e54dc05b9bf5f3d0bc0fbe92624a2ed203f4e124e090de1",
    "signature": "0x8a2a717f661c5024107899d4a13d49a646ee6630f642259a47de6ec4b998195f0e1af91c323c987b8d6b18719c532869dd4a44fc9cc2110d327dad3d8c2ab5761b",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}