Callisto: Tech to combat sexual assault
https://www.projectcallisto.org/
This seems like a very good system.
Victims can cross-check and report but there is a third choice: just create a timestamped record of the event.
Sometimes victims don’t feel ready to report an event to the police, but still wish to make a timestamped record of an event so that, in the event that the perpetrator turns out to be a serial perp, the record can be presented as evidence.