Hypotheses could be sealed upon filing. The existence of sealed hypotheses could/should be public, to prevent the system from being gamed by filing dozens of hypotheses at once for the same experiment and then selectively unsealing the one that matched their results. If the experimenter had too many sealed hypotheses to their name, that would be seen as cause for concern. But only a handful of sealed hypotheses would be unlikely to raise any eyebrows. Furthermore keeping one's sealed:unsealed ratio low would be an incentive to publish negative results. This system would also protect the experimenter from political pressure if they were testing a controversial hypothesis.
