It is well to remember that, at a singular level, racing lives on secrecy. The only way the mettle of a horse can be proven is in competition, on the race track.
Every step taken in the heat of racing is recorded somewhere, and can be referenced with ease.
The wonder of thoroughbred racing derives from the fact that the only existing unknown is who the winner will be. So-called insiders lose as often as they win. The quantitative difference between the best and the most common horses boils down to a matter of two seconds. Which way the horse will go in any given race is the secret that all racetrackers believe they alone know. In part it is a secret held in order to profit from wagering.