Timejacking bitcoin mining
Posted On 26.01.1966
News: Latest stable version of Bitcoin Core: 0. I timejacking bitcoin mining patch my clients not to accept time corrections from the bitcoin network and think that the clock skew acceptance built in to the bitcoin network is insane.
Or at least silly and out dated. It would be great if you contribute it back to core so that others can enable it as an option. With regards to the suggestions of integrating NTP into the bitcoin client, I think it is a bad idea. The bitcoin client is simply not an appropriate place to put timekeeping software.
If I were emperor, I would make the client turn red if it thinks the local clock is off by more than 5 seconds from what the peers report, and refuse to run if off by more than 30 seconds. If similar data was just made available from the command line, I would write some munin plugins to graph the data. Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. The native Windows NTP works well only in domains. For the regular Windows boxes that are just members of a workgroup there are multiple problems. Majority of those problems are caused by the various add-ons, but I don’t know how many people run just bare Windows machines with software only from Microsoft.
The code to properly query the Windows Time Service would be more complex than just a simplest generic SNTP code. It is trivial, and probably wrong. When this came up on the mailing list the other day, I suggested that we scrap everything involving timekeeping in the client and protocol, and start over with the requirement and assumption that the local clock be correct. It wasn’t a popular proposal, but I’m pretty sure it is still the right thing to do. I routinely ignore posters with paid advertising in their sigs.
If someone can’t manage to get it installed and working, they have no business using bitcoin. We should not write our own buggy implementation of NTP when other good options exist. Notice that bitcoin does not include an antivirus scanner either, but the same arguments that would apply to including NTP would also apply equally well to virus protection. In a free world we do not have any control over who does or does not run the software. What we are trying to do is protect the network. Accurate packet time stamping is an important aspect of p2p protocols. We can ban or throttle peers who send msgs who’s time stamp is skewed from our own clients.
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