The original method of using stickers with genuine keys has become obsolete, now the keys are digitally signed to the hardware but you can bind it to your account, in case you ever need to reactivate Windows. The link below contains the guide for adding an account and reactivating Windows.

https://support.microsoft.com/en-us/help/20530/windows-10-reactivating-after-hardware-change

Once you have your new system up and running, please make sure to link an existing Microsoft account to your Windows Digital key.

https://support.microsoft.com/en-us/help/12440/windows-10-activate