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Thieves are planning an inside job. They forge the surveillance video ahead of time, do the theft and submit the forgery to be timestamped while it's happening.

Also, a lot of surveillance systems are purposely kept offline to prevent them from being compromised, but your system doesn't allow that because they would need external connectivity to get signatures.

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Sure when you're controlling the source, you can fake it. But requiring the fakes be prepared ahead of time locks the faker into one story that may be contradicted by other evidence.

That's pretty much what happens anyway. The police are going to come collect the footage as soon as the crime is reported and you can't change it after they do.

This technique is known as an Ella Fitzgerald to those in the heisting industry, as popularized in the documentary Oceans 11.

Oceans 11 is a work of fiction because most people don't have that skillset and the ones who do can make a lot of money doing honest work without risking a long prison sentence, so they're not tempted to rob casinos to heisting music.

The issue here is that the skillset required to produce the forgery has fallen to the level that anybody can do it and then that's enough people that somebody actually does.

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