{
  "manageEntity": {
    "action": "Save",
    "entityId": "148719",
    "entityType": "Track",
    "nonce": "0x37f88631168f910b2816edbc21902c56c83a696c823e8fa7124aac4c6717a41d",
    "signature": "0xcbbbbf30cf8824c7ab4a3bb7852791c5c329dd306544a652601d0f1ca8abbb593cb4a026caf7ace18e78e8cdc260d43db9e391b3db8462777eb4f0eb0f53e0b01b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}