OpenBitTorrent (OBT) and PublicBitTorrent (PBT) are back online today after three weeks of protest.

On Sunday we reported that the trackers were planning to come back after a much-needed improvement to the BitTorrent protocol, and they’ve kept their word.

Thanks to the improvement, which was coined by Pirate Bay co-founder Fredrik Neij, the trackers will enjoy a great reduction in bandwidth and resources.

“This is going to save us a considerable amount of money and will benefit the BitTorrent community in the long run. It’s a great step forward and guarantees the survival of open BitTorrent trackers,” OpenBitTorrent’s owner told us previously.

The protocol improvement, which will be implemented in the upcoming uTorrent release, also gives web admins the ability to prevent their sites being hammered by BitTorrent traffic.

OBT and PBT are the two largest BitTorrent trackers on the Internet. Both coordinate the downloads of millions of people at any given time.