What can we actually verify about Project Blue Beam?

The first thing to pin down is the document itself. A remembered summary, even one that sounds detailed, is not the same as a dated copy with a clear origin. If different versions can be found, compare their wording and dates. That can help establish what a text claimed, though it still would not prove the plan existed.

Without a traceable original, details such as the exact sequence of events or predicted scale of an attack are best described as claims in later retellings, not confirmed contents of a verified government document.

Some of the imagery gets described as a giant hologram floating in open sky. A projection usually needs a surface or something in the air to scatter light, so a convincing image visible across a huge area is a different challenge from making an image appear on a screen. Directed sound is a real, limited technology, but that is not the same as transmitting a voice directly into someone's mind.

Those technical distinctions do not settle every claim about unusual aircraft or military projects. They do mean that a video of a light or an unfamiliar craft is not, by itself, evidence for the full scenario.

I'd separate plausibility from evidence. A government could try to deceive people in various ways, but that general possibility does not show that a staged attack happened or was planned. Reports of unusual craft, dramatic clips, and secondhand accounts need independent checks before they can support a specific conclusion.

Even if some advanced aircraft were verified, that would establish only that aircraft existed. It would not establish projected religious figures, a fabricated alien invasion, or a coordinated political plan. Each part needs its own evidence.