It's too bad this cant qualify as some sort of world record
The nuclear explosion may or may not have caused said plug to reach space - the data from the cameras indicate it had at least 6 times the needed escape velocity, but it is difficult to estimate whether it would completely disintegrate or if enough of it would survive the atmosphere and whether it would "count"
https://nuclearweaponarchive.org/Usa/Tests/Plumbob.html (look for Pascal-B)
It was also slower, 150,000 mph, than Parker Solar Probe, which reached 430,000 mph.