[gjvnq]

Noob question: why not make a big delay to start processing build jobs (something like 1 hour). By then, whatever input they wanted to hash will be useless as a new block will be already minted.

As for build scripts that require a network connection, just make the connection painfully slow.

[BrendanLong]

They're not starting a CI job per hash (that would be too slow). I'm not sure exactly how each of these cryptocurrencies works, but presumably what they're doing is starting a miner which attempts hashes for a while and then stops. And the only reason the jobs stop at all is that it would be too obvious if they ran continuously.

[xyzzy123]

Because then your CI provides slow feedback on changes :/

[hnarn]

Isn't this discussion about free CI? Seems like the answer is quite simple then: if you want it faster, pay for it.

[gjvnq]

Makes sense