It might be worth coming up with a general mechanism for Secret but Confirmable information. Following drafty draft needs help:
The Rules can define a type of information as Classified. To do so, the Rules must specify a date or event after which that type of information becomes Declassified. A person CAN publish a text string of limited size, clearly labeling the sting as containing a specific, defined type of classified information. Such a string is an Encoding. The recordkeepor of the indicated type of information SHALL track such encodings when e reports eir record for that information, up until the time the recordkeepor announces its declassification. As soon as possible after a particular Encoding becomes Declassified, its recordkeepor SHALL announce the declassification. As soon as possible after such an announcement, the originally posting player CAN and SHALL Decode the information by publishing a different statement (the Plaintext) and publishing or referencing a method (the encoding algorithm) by which the Plaintext was converted into the Encoding. If the plaintext is published within the time limit, and if the encoding algorithm is a method that is: (a) reasonably and generally available to most players, such that most players could confirm that the plaintext produces the encoding via the algorithm; (b) not tailored to the message so that it would not function for arbitrary text strings of a similar nature; and (c) makes it sufficiently difficult to create multiple sensible plaintexts that could lead to the same encoding; then the encoding is interpreted as if its plaintext had been published at the time the original encoding was published. [ This is meant to have safeguards. It's meant to allow flexibility (i.e. choice of algorithm from among common ones) without abuse. Condition (b) is meant to prevent "my algorithm is that AGAINT = FOR" Condition (c) is meant to prevent encoding with "1=AGAINST 2=FOR" and then decoding with "1=FOR 2=AGAINST". The original poster also MUST decode the information. Otherwise, a trivial trick is to publish two hashes (1 for FOR, 1 for AGAINST) and then only decode one of them. Probably other holes, that's the fun tho. ]