[jstanley]

That's fine, but when a request comes in referencing only a hash and not an id (because you're not leaking ids to clients), how do you get the id?

[wongarsu]

Good point. Back when we did that we just used a reversible hash function (some would call it encryption). There are some simple algorithms meant for encrypting single integers with a reasonable key.

[iforgotpassword]

I might be misremembering, but didn't YouTube do this in the early days? So yeah, that was what I was thinking of when replying, not a traditional hash function.