James Randi Million-Dollar Paranormal Challenge.
official-recordframeworkStargate / Remote Viewing
The JREF prize (1964-2015; $1M from 1996) offered to anyone demonstrating paranormal ability under an agreed protocol; 1,000+ applicants, none passed.
Rhetorically potent and unclaimed = documented. But a single prize-test cannot settle a science, and the demanded significance bar was impractical for a small effect, so proves-psi-impossible is a competing-explanation overreach.