Could a tiktok user's secUid ever change in its lifetime?

[ZYinMD]

I know a tiktok user's id (integer) won't ever change, while @uniqueId can definitely change, but what about secUid? If secUid also never changes, what's the purpose of it?

[liamengland1]

No it doesn't

[ZYinMD]

If it can never change, then why did TikTok create it in the first place? Both the id and the secUid can be used to identify a user, and the secUid is not more secret than the id.

[liamengland1]

How am I supposed to know that? Do I work at tiktok? :-)

[ZYinMD]

Well, it's very possible that someone more experienced than me may know, it could be a standard practice in API designing. For instance, maybe it prevents certain attacks which increments the id by 1 to get to the next user. I don't know, but I've read about things like it in other places.

[adiantek]

They changed ID and secUID :o
6653803073764855814 - old ID
6653806073764855814 - new ID
xS4wLjABAAAAYCsPXEsmmsB9v2JCv6vSEW-CXqSkfNL88ME6qw8Md-d8F_zkcrHQu0b3tz5mlQJa - old secUID
MS4wLjABAAAAYCsPXEsmmsB9v2JCv6vSEW-CXqSkfNL88ME6qw8Md-d8F_zkcrHQu0b3tz5mlQJa - new secUID
It happened only to my friend's account, don't know why. I tested other accounts and without changes.
When I make item_list (old ID and old secUID) request I'm getting an empty item list XD

[ZYinMD]

That is very hard to believe, a single digit change. I don't know your setup, but I'd rather believe it's somehow a human error made by you.

[adiantek]

He wrote with support about verify account and change phone number. I had a statistics crawler and before I wrote this I saw that there are 0 videos. You can check it and make item_list request - you will get 0 videos, but if you make a human error you will get an invalid entity exception (secUID not found). But still - don't know why they changed one digit of ID and secUID.