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[Note: This question has been re-posted on crypto.SE.] Let's break down the problem into two parts: The first problem is that you want something that looks random to an outside attacker (ie is unpredictable), but can be computed by anybody in the know. That sounds a lot like a Cryptographically secure pseudorandom number generator (CPRNG) where all nodes ...


Some questions can be answered, other are speculative. X.509 relies on ASN.1. ASN.1 defines two data types for dates, UTCTime and GeneralizedTime. UTCTime has only two digits for the year, so it is not Y2K-clean; it was defined in the late 1980s out of what can only be described as a consummate lack of foresight. It was temporarily fixed by defining that ...


You can put the hash of your commit into Bitcoin blockchain, and after some blocks added upon the block having your hash, you will be able to convince people that you had had that commit prior the time the block has been added into the blockchain.

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