I'm 99.99% sure it's a scam. Whenever i click "Generate" button, it always create POST request. While the data itself is either encoded or encrypted, the data is different on each POST request.
Anyway, i'm leaving negative feedback to those users.
And in general, i expect they also use it to generate code which leads to buggy software.
@Charles-Tim Your links are broken or not visible on the forum.
Also note that it uses the name and logo of the OneKey hardware wallet in an attempt to lend credibility to the site:
There is no issues tab on the project's github for users to report possible bugs and vulnerabilities in the code.
Although the description at the bottom of the site states that the code is 100% open source, I'd not use it in any way to generate my mnemonic phrases or restore keys.
The code doesn't add any improvements in relation to iancoleman, it's simply a copy and paste, so i'm not the best person to say that the site is 100% reliable or malicious, but in any case, it's better not to use it in real use cases.
These days I was searching on Google out of curiosity for sites similar to iancoleman, most of them are copies of the same, that is, there are several out there and the chance of them being malicious is 99.9%
