[fareesh]

I remember it being a practice at one time in various IRC and other online communities to share hashes of the exploit payloads between teams so that they knew whether or not there was one or more than one, and whether or not they were going to collaborate.

[willstrafach]

Nah, hashes were public as proof (Usually later followed by a zip file matching the hash).

On IRC, we generally knew who did or did not have vulns and trusted not to BS. That implicit trust did make things difficult.