[*] Linus Torvalds got the idea of a Cryptographic Hash Function Directed Acyclic Graph structure from an earlier distributed revision control tool named Monotone.
OT trivia: The idea actually predates either monotone or git; opencm (http://opencm.org/docs.html) was using a similiar technique for VCS access control a year or two prior to monotone's first release.

Note that I didn't say Monotone invented it. :-) Graydon Hoare of Monotone got the idea from a friend of his who, as far as we know, came up with it independently. I personally got it from Eric Hughes who came up with it independently. I think OpenCM got it from the Xanadu project who came up with it independently. :-)

Getting back towards topic, the hash function employed by Git is showing signs of bitrot, which, given people's desire to introduce malware backdoors and legal backdoors into Linux, could well become a problem in the very near future.

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