welcome new friend

we love to meet new friends and new projects
i see intersting pages
https://jacksclub.io/provably-fair <-- good
and
https://jacksclub.io/vulnerability-disclosure <-- very good
questions about
New findings, if it's reported previously by another researcher, it's considered as a duplicate and not rewarded;
how do I know if it's true that it was discovered earlier? you use platform like intigriti or hacker1?