They’re short unique strings:
Sqids (pronounced “squids”) is an open-source library that lets you generate YouTube-looking IDs from numbers. These IDs are short, can be generated from a custom alphabet and are guaranteed to be collision-free.
I haven’t dug into the details enough to know how they can be guaranteed to be collision-free.
As usual, you can also use this squid post to talk about the security stories in the news that I haven’t covered.
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