On 17 June 2010 04:06, Zooko Wilcox-O'Hearn <[email protected]> wrote: > Wow -- music sharing network with integrated Chaumian ecash (the > "lucre" implementation thereof). I don't know what to think. Are you > familiar with the history of Mojo Nation? >
Yes, broadly... I've played around with Mnet a bit, though I'm not sure where Mojo Nation ends and Mnet begins. Thanks to iang for the article, I hadn't seen that one before. I knew that Bram Cohen was part of EGBT, but interesting to see that BitTorrent was an explicit paring-down of Mojo Nation. The main difference I suppose is that robonobo uses the currency to achieve streaming performance rather than just fairness (though it does that too). We divide leechers into two groups, those who want the stream in real time and those who are downloading it for later. All nodes auction off their bandwidth, and real-timers bid more than download-laters; the bid ratios are set up so that the network protocol resolves to TCP for real-timers and TCP-LP [1] for download-laters. Our aim is to achieve an 'instant play' experience in an uncontrolled (and open source) p2p network. All this bidding is done completely transparently to the user - we infer whether a stream is real-time or download-later from what the user is doing with the UI. The user just sees an account balance that goes up and down. Bidding paramaters are tweakable in config files, and we also allow users to plug-in their own auction strategy (the default one is probably very naive). I know that Mnet does some performance-related stuff, in that chunks are uploaded in highest-bid-first order, but during my (admittedly limited) playing around this didn't seem able to give differential rates while maximising available bandwidth. While you're here, Zooko, a MN question (perhaps a memory test :-) - my understanding is that in a MN network, an uploading node sends data until a threshold is reached, at which point it demands a Mojo token transfer. How does the protocol deal with a node downloading data up to the threshold, then disconnecting, and repeating this process with other nodes, hence downloading without ever paying anything? I ask because I'm currently implementing an escrow system within robonobo to deal with this attack. W [1] http://www.ece.rice.edu/networks/TCP-LP/ _______________________________________________ p2p-hackers mailing list [email protected] http://lists.zooko.com/mailman/listinfo/p2p-hackers
