TestFlight signature is referred to as Apple TF signature - quickly put on the shelves in 19 minutes..

Apple TF signature is a distribution model officially recognized by Apple, which allows users to install with more confidence; tf signature internal testing download applications no longer need to click on the trust certificate and can be downloaded and used directly; application update information is pushed through Apple's official channels, which is more convenient and fast, and can be used on any Apple device.
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