Information on attacks
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A typical successful 51% attack allows the attackers to spend money twice. Having superior hash power, they can generate blocks faster than the rest of the network. They can fork the block chain, spend money on either branch with the necessary number of confirmations required, then abandon it by switching to the other branch where the money were not spent and continue it to make the primary block chain eventually. Confirmed transactions on the abandoned (orphaned) branch will be void; unconfirmed transactions are likely to be submitted by the clients again. Such activity requires much more hash power than 51% though. The attackers often try to DDoS largest pools to decrease network hash rate. If they’re down, the assault becomes easier.
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Just out of curiosity, is there a possibility people are doing this with botnets? Because that would suck…
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[quote name=“ghostlander” post=“6830” timestamp=“1369604807”]
A typical successful 51% attack allows the attackers to spend money twice. Having superior hash power, they can generate blocks faster than the rest of the network. They can fork the block chain, spend money on either branch with the necessary number of confirmations required, then abandon it by switching to the other branch where the money were not spent and continue it to make the primary block chain eventually. Confirmed transactions on the abandoned (orphaned) branch will be void; unconfirmed transactions are likely to be submitted by the clients again. Such activity requires much more hash power than 51% though. The attackers often try to DDoS largest pools to decrease network hash rate. If they’re down, the assault becomes easier.
[/quote]So people should set up their client for either another pool or solo mining as backup, can be easily done with --failover-only in cgminer, to keep the hashrate up during an 51%/ddos attack
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[quote name=“svennand” post=“6832” timestamp=“1369605037”]
[quote author=ghostlander link=topic=853.msg6830#msg6830 date=1369604807]
A typical successful 51% attack allows the attackers to spend money twice. Having superior hash power, they can generate blocks faster than the rest of the network. They can fork the block chain, spend money on either branch with the necessary number of confirmations required, then abandon it by switching to the other branch where the money were not spent and continue it to make the primary block chain eventually. Confirmed transactions on the abandoned (orphaned) branch will be void; unconfirmed transactions are likely to be submitted by the clients again. Such activity requires much more hash power than 51% though. The attackers often try to DDoS largest pools to decrease network hash rate. If they’re down, the assault becomes easier.
[/quote]So people should set up their client for either another pool or solo mining as backup, can be easily done with --failover-only in cgminer, to keep the hashrate up during an 51%/ddos attack
[/quote]I get about 15k/h mining LTC. Is it even worth me solomining? I couldn’t seem to connect to any of the pools kept coming back with json error. Though as I said I mine LTC using Ozpool just fine.
C
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Scrypt botnets are CPU only. Consider about 30KH/s for a 3GHz quad core i7 with HT enabled. A 3GHz Core 2 Duo or Athlon X2 won’t hit even 10KH/s while an old mainstream HD5750 is capable of >150KH/s. Fat chance for botnets.
15KH/s? It’s not worth to mine solo with 150KH/s or even with 1.5MH/s unless difficulty descreases significantly.
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[quote]Scrypt botnets are CPU only. Consider about 30KH/s for a 3GHz quad core i7 with HT enabled. A 3GHz Core 2 Duo or Athlon X2 won’t hit even 10KH/s while an old mainstream HD5750 is capable of >150KH/s. Fat chance for botnets.
15KH/s? It’s not worth to mine solo with 150KH/s or even with 1.5MH/s unless difficulty descreases significantly.[/quote]
Well that is good to know:)
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[quote name=“ghostlander” post=“6840” timestamp=“1369607721”]
Scrypt botnets are CPU only. Consider about 30KH/s for a 3GHz quad core i7 with HT enabled. A 3GHz Core 2 Duo or Athlon X2 won’t hit even 10KH/s while an old mainstream HD5750 is capable of >150KH/s. Fat chance for botnets.15KH/s? It’s not worth to mine solo with 150KH/s or even with 1.5MH/s unless difficulty descreases significantly.
[/quote]1: GPU botnets by injecting mining code into a fake upgrade for a game.
2: Data centers and botnets with 10s of thousands per fleet.Still most likely is people who believe in ZTC, Zee Troo Coeen! putting together a rogue pool.
There is a simple way to handle this. Set up the marketplace in forum so we ignore the prices on the exchanges. Those prices are pure fantasy and we should only use them to acquire cheap coins from unbelievers.
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Most people with Radeons don’t even bother to install OpenCL. BTW, scrypt miner needs to be configured manually in order to run fast.
[quote]There is a simple way to handle this. Set up the marketplace in forum so we ignore the prices on the exchanges. Those prices are pure fantasy and we should only use them to acquire cheap coins from unbelievers.[/quote]
A good idea.
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[quote name=“ghostlander” post=“7082” timestamp=“1369653620”]
Most people with Radeons don’t even bother to install OpenCL. BTW, scrypt miner needs to be configured manually in order to run fast.
[/quote]The upgrade would do the install.
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Very clear and transparant :)
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Very informative.
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is there something happening with attack? i am seeing trouble connecting to two different pools and the total hash# is down and the FTC hash# on coinotron is down alot
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ftc.d2.cc pool is working just fine, I also have trouble reaching http://www.coinotron.com/ so it seems coinotron might have some troubles…
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people talking about attacks…is it true or bogus?
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Something odd is going on right now, most pools are down and my deposit to btc-e hasn’t been credited at 16 confirms. I am dedicating hashrate right now to help counteract the attack that is likely happening right now I hope others do as well.
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[quote name=“meetrat1” post=“11200” timestamp=“1370732355”]
Something odd is going on right now, most pools are down and my deposit to btc-e hasn’t been credited at 16 confirms. I am dedicating hashrate right now to help counteract the attack that is likely happening right now I hope others do as well.
[/quote]The 16 confirms isn’t unusual… last week, I had more than that until they eventually confirmed it.
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[quote name=“justabitoftime” post=“11202” timestamp=“1370732431”]
[quote author=meetrat1 link=topic=853.msg11200#msg11200 date=1370732355]
Something odd is going on right now, most pools are down and my deposit to btc-e hasn’t been credited at 16 confirms. I am dedicating hashrate right now to help counteract the attack that is likely happening right now I hope others do as well.
[/quote]The 16 confirms isn’t unusual… last week, I had more than that until they eventually confirmed it.
[/quote]Last time I transferred FTC there it took over 40 confirms lol
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[quote name=“justabitoftime” post=“11202” timestamp=“1370732431”]
The 16 confirms isn’t unusual… last week, I had more than that until they eventually confirmed it.
[/quote]Oh ok good to know, thanks.
Edit: Pools seem to be back up.
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[quote name=“meetrat1” post=“11206” timestamp=“1370732808”]
[quote author=justabitoftime link=topic=853.msg11202#msg11202 date=1370732431]
The 16 confirms isn’t unusual… last week, I had more than that until they eventually confirmed it.
[/quote]Oh ok good to know, thanks. Although it seems as though something is up given that most ftc pools seem to be down.
[/quote]The pools are something I don’t know about… I’m shooting our Miner leads and Bushstar a message. The additional confirmations from BTC-e are to protect possible attacks.
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I think summat could be up.
I have found no blocks all day and now the block that I did mine has died too. Started mining back on Serraz pool and lost a block there too. Been over 2 hours since finding a successful block.
On the other hand… Could be crappy luck. :-\
