{
  "manageEntity": {
    "action": "Save",
    "entityId": "657875450",
    "entityType": "Track",
    "nonce": "0x0e52d9c0f2bae7c5d5a8c5642dff117c6f36d28cd3c40bc3810d9c658b80144d",
    "signature": "0x0c0e9a7c782adacca45c91f0289e64894f942242516acd6adbaa2f6373d72ff813beea2ab6f6eaad81c7a25e5539cf4cf73450d8c995e3c50445d5df93af473a1b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}