Official Record? (Score 1)

http://www1.nasa.gov/missions/research/x43_gwr.html
This site seems to suggest the official record is mach 6.8316 and has a picture of the guiness book of records certificate to confirm it. I remember watching videos on this stuff years ago and they were talking about reaching just over mach 6 so it irked me a bit when they said the official record was 3.3 :(