[macOS] AppTransaction questions (internet connection requirement)

Hello,

I hope to find out more about how AppTransaction works on macOS, specifically about its internet connection requirements: if I use this to validate that the app is a legit purchase from the Mac App Store, I would not want it to have an always-on requirement just to validate.

1. Does AppTransaction require the user to always be online for AppTransaction.shared ?
2. When an app is downloaded from the Mac App Store, is the data needed for AppTransaction automatically embedded during that download, or is that data downloaded upon first launch of the app, therefore requiring an internet connection at launch time?
3. Once the data/receipt has been downloaded by AppTransaction, is it cached until the app's next update, or is it cleared at some time during the version's life and needs to be re-downloaded, therefore requiring an internet connection at launch?
4. Where is that receipt/data stored?

Also, if you don't mind me sneaking in this non-related but sort of related question, in terms of receipt validation:
Does macOS Sequoia's MAC address rotation feature affect receipt validation in any way when using IOKit?

Thank you kindly,
– Matthias