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A comment on No Cheating Allowed. Parent comment

Re:No Cheating Allowed by cjg on Tuesday August 18, 2015 @05:30AM (#10078232)
No, because if you have the ability to create the hash on the machine then you have the ability to create a hash for a manipulated version.

The blockchain gets round this with consensus.

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Re:No Cheating Allowed by Asbostos on Tuesday August 18, 2015 @05:44AM (#10078273)
A hacker does yes, but can a kid recreate the hash quickly without the teacher noticing? If some script appear on the net to automate that, Khan academy could react by changing their hash frequently.
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Re:No Cheating Allowed by douche on Tuesday August 18, 2015 @07:51AM (#10078672)
I think you give the teachers far too much credit.
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