'what pattern does Whatsapp use to encrypt profile picture urls?

I set my privacy settings on WhatsApp so that nobody can see my profile picture,

and I went on WhatsApp web to see if the profile can be shared through the link in dev tools, and when I pasted the link in a different browser agent, it couldn't be reached, and the link is almost indecipherable, so I'm curious how does WhatsApp make such encrypted URLs?



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