When using the device check, it Generates the new token every time like below,
Generated Token :
eyJiaXQwIjpmYWxzZSwidG9rZW4iOiJBZ0FBQUVMcFdkRkZXdkF0aE5CUU80Zyt3V1FFVU5rMCttZTg5dkxmdjVaaW5ncHlPT2tnWFhYeWpQellUeldtV1N1K0JZcWNENDdieWlyTForKzNkSmNjcEY5OWhXcHBUN0c1eEF1VSt5NTZXcFNZc0FRTVVyaTJZSGplTVo3NmJnM3hqa1ozTnZpdFM2Q3NoWFJPNUVl
Using bit values along with token we can find the device is present or not in the apple, even if we uninstall the app. But how it can be useful for uniquely identifying a device.
Success response:
{"status":200,"bit0":false,"bit1":false,"lastUpdated":"2018-10"}
Server request:
{
"device_token" : "wlkCDA2Hy/m5jQ1cs..." "transaction_id" : "4-w3d4-567-2376674f8uj8", "timestamp" : 1487716472000
}
This is the link i used for my code :
very intentionally by Apple, DeviceCheck tokens can not be used to identify the specific device.