TERRACOIN ATTACK OVER 1.2TH ATTACK CONFIRMD

clockuniverse

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Quote from: Trillium on September 16, 2013, 05:42:44 PM

Quote from: bitcoinreactor on September 16, 2013, 12:18:43 AM

Quote from: roy7 on September 16, 2013, 12:10:52 AM

As-is, TRC probably won't sort itself out using this algorithm until sometime after BTC's difficulty increase pushes TRC profitability up even at the higher difficulty level. If it does raise to 400K, then it should eventually settle around the point the profitability is similar to BTC's.

A shorter retarget window (with smaller max changes) is probably called for.

not sure about that : current estimations shows an estimated difficulty at next retarget block of 44059 (in 161 blocks)
(this varies a lot, due to the insane increase in hashrate seen yesterday)

This is higher than previous decrease, where it went down to 20k diff.

The next 2160 blocks after this retarget will be quite crazy, but then diff should increase to 160k or so, a much more reasonable value imho, with current hashrate (i saw more 3TH/s at coinotron recently).
Actually in the process of rewriting a pool engine (actually, pool engine is rewritten, website and extra tools on their way), this puts quite some stress on the infrastructure, and more will come in a few more blocks (123 at the moment). Hopefully, things will stabilize right after the next 2160 crazy blocks we're gonna see in a few hours.

But i agree, profitability/markets will play an important role there. On a short-term range, reducing the retarget window may indeed help, but on the long-term it shouldn't change anything. Hopefully, hashrate will stabilize once at 160k diff.

EDIT : new estimated diff : 43887 (in 67 blocks) ; this is gonna hurt :p
43783 (in 19 blocks)

Pretty much what you predicted happened last night. Diff dropped to 40-something k and my cgminer was literally just endless lines of "Stratum from pool 1 detect new block" (solo mining). The block times were about 5 to 10 seconds. Somebody made a lot of TRC!

As of this morning I wake up to find diff raised to 175k to compensate. Now its going to be a very slow march to get it back down. Still ~11 TH/s on the network... wonder how long it will stay.

There is now a mandatory Terracoin wallet update. View the whole thread here: https://bitcointalksearch.org/topic/ann-terracoin-trc-est-2012-1364146

Trillium

hero member

Activity: 546

Merit: 500

Quote from: bitcoinreactor on September 16, 2013, 12:18:43 AM

Quote from: roy7 on September 16, 2013, 12:10:52 AM

As-is, TRC probably won't sort itself out using this algorithm until sometime after BTC's difficulty increase pushes TRC profitability up even at the higher difficulty level. If it does raise to 400K, then it should eventually settle around the point the profitability is similar to BTC's.

A shorter retarget window (with smaller max changes) is probably called for.

not sure about that : current estimations shows an estimated difficulty at next retarget block of 44059 (in 161 blocks)
(this varies a lot, due to the insane increase in hashrate seen yesterday)

This is higher than previous decrease, where it went down to 20k diff.

The next 2160 blocks after this retarget will be quite crazy, but then diff should increase to 160k or so, a much more reasonable value imho, with current hashrate (i saw more 3TH/s at coinotron recently).
Actually in the process of rewriting a pool engine (actually, pool engine is rewritten, website and extra tools on their way), this puts quite some stress on the infrastructure, and more will come in a few more blocks (123 at the moment). Hopefully, things will stabilize right after the next 2160 crazy blocks we're gonna see in a few hours.

But i agree, profitability/markets will play an important role there. On a short-term range, reducing the retarget window may indeed help, but on the long-term it shouldn't change anything. Hopefully, hashrate will stabilize once at 160k diff.

EDIT : new estimated diff : 43887 (in 67 blocks) ; this is gonna hurt :p
43783 (in 19 blocks)

Pretty much what you predicted happened last night. Diff dropped to 40-something k and my cgminer was literally just endless lines of "Stratum from pool 1 detect new block" (solo mining). The block times were about 5 to 10 seconds. Somebody made a lot of TRC!

As of this morning I wake up to find diff raised to 175k to compensate. Now its going to be a very slow march to get it back down. Still ~11 TH/s on the network... wonder how long it will stay.

bitcoinreactor

member

Activity: 112

Merit: 10

Quote from: roy7 on September 16, 2013, 12:10:52 AM

As-is, TRC probably won't sort itself out using this algorithm until sometime after BTC's difficulty increase pushes TRC profitability up even at the higher difficulty level. If it does raise to 400K, then it should eventually settle around the point the profitability is similar to BTC's.

A shorter retarget window (with smaller max changes) is probably called for.

not sure about that : current estimations shows an estimated difficulty at next retarget block of 44059 (in 161 blocks)
(this varies a lot, due to the insane increase in hashrate seen yesterday)

This is higher than previous decrease, where it went down to 20k diff.

The next 2160 blocks after this retarget will be quite crazy, but then diff should increase to 160k or so, a much more reasonable value imho, with current hashrate (i saw more 3TH/s at coinotron recently).
Actually in the process of rewriting a pool engine (actually, pool engine is rewritten, website and extra tools on their way), this puts quite some stress on the infrastructure, and more will come in a few more blocks (123 at the moment). Hopefully, things will stabilize right after the next 2160 crazy blocks we're gonna see in a few hours.

But i agree, profitability/markets will play an important role there. On a short-term range, reducing the retarget window may indeed help, but on the long-term it shouldn't change anything. Hopefully, hashrate will stabilize once at 160k diff.

EDIT : new estimated diff : 43887 (in 67 blocks) ; this is gonna hurt :p
43783 (in 19 blocks)

roy7

sr. member

Activity: 434

Merit: 250

Yes the latest TRC client mirrors BTC's own adjustment algorithm. So it changes every 2160 blocks. There is a max change cap of x4 or /4, so what happened last change was it went down to /4 because of the long time it had been too slow. Then everyone piled in since TRC was so much more profitable than BTC. Forcing it back up by 4x.

As-is, TRC probably won't sort itself out using this algorithm until sometime after BTC's difficulty increase pushes TRC profitability up even at the higher difficulty level. If it does raise to 400K, then it should eventually settle around the point the profitability is similar to BTC's.

A shorter retarget window (with smaller max changes) is probably called for.

CoinEraser

legendary

Activity: 1988

Merit: 1768

Build 0.1.3-48 available
This build include the new retargetting algorithm, returning to a common retarget window.
Target will be adjusted at 2160 blocks interval

http://www.terracoin.org/news/

Trillium

hero member

Activity: 546

Merit: 500

A bit necro but there arn't many TRC threads on BCT.

I have noticed that on most days the network hash rate is ~400-600 GH/s. I was surprised to see that no matter how many blocks pass, it seems now that the network difficulty has remained constant at 104K diff. I suppose there could be something wrong with my client/miner but it seems to be the case on multiple computers so perhaps not.

However, yesterday I saw that the network hash rate climbed to about 4500 GH/s. Right now (http://cryptocoinexplorer.com:3750/) it's being reported at over 17000 GH/s (17 TH/s). http://coinchoose.com/ indicates 15 TH/s. But the diff is remaining at 104K despite block times down to between 30-60 seconds (supposed to be ~2 min avg).

Were there changes made to the difficulty adjustment algorithm to prevent the previous 'time-warp' attacks described in this thread? I see that its now set to adjust ever 30 blocks (http://www.coinwarz.com/cryptocurrency/coins/terracoin) however it seems strange it always goes back to 104K diff given the hash rate variance (at least between 400-600 GH/s if not more with this T-hash boost).

Also, 15+ TH is a lot. I suspect either the coin is once again being exploited OR a profit-switching pool has aimed in terracoins direction, although I had thought those were always only scrypt based. Are there switching pools for ASIC miners too?

Huh

roy7

sr. member

Activity: 434

Merit: 250

Quote from: scrypt on August 17, 2013, 04:12:12 PM

Just realized that my TRC wallet is empty. There were just few coins, but still..
Transactions log is empty also.
Is this because of the attack?

Possibly. Did you install 0.1.3-48 before block 181200? If not, install it now and run it once with -reindex. That should get you sycned in and give your wallet accurate information on your coins.

scrypt

newbie

Activity: 16

Merit: 0

Just realized that my TRC wallet is empty. There were just few coins, but still..
Transactions log is empty also.
Is this because of the attack?

hromisko

newbie

Activity: 8

Merit: 0

Quote from: bcp19 on August 08, 2013, 12:53:10 PM

Quote from: hromisko on August 08, 2013, 12:39:29 PM

Quote from: smoothie on August 08, 2013, 12:11:52 PM

Quote from: hromisko on August 08, 2013, 12:06:58 PM

Since it seems it continues and I'm getting somewhat pissed off by what is currently going on with TRC, I created a blacklist available here:

http://teracoin.org/blacklist

Which records major past&present acts which I personally consider as contradictory to the spirit of CryptoCoin movement.
The idea was to deploy a full-fledged economy and not a playground for morally crippled criminals, no?

Ideally, in the future, merchants and exchange offices shall simply not accept coins which have ever passed through such dirty addresses.

Perhaps you should look into the possibilities of exploits with a particular coin before using it?

TRC exploits have been foreseen many months ago, especially the one where ASICs can jack up the difficulty at a moments notice.

Dear smoothie,

Existence of exploits is not my concern. Since it has been long ago postulated by many wise persons whose opinion I respect that EVERY SYSTEM IS EXPLOITABLE (BTC included, of course), I personally consider it to be a waste of time to give a big fck about exploits. What interests me, however, especially in this stage of CryptoCoin paradigm shift, is to propose robust reactive mechanism against immoral usage of such exploits.

Blacklist whose URL is above is my minute contribution to such a mechanism.

(a propos, many [ c.f. https://bitcointalksearch.org/topic/m.30913 ] things were "foreseen" months before You even registered to this forum, thus if I were You I would be somewhat reluctant in making definitive statements from such a distinguished supervisory pose)

Maybe you can reformat your page? All I see is 1 long continuous line of garble that makes no sense.

I don't know how Your browser displays pure text files but the http://teracoin.org/blacklist ain't nothing else than a ";" separated CSV file whose
1st column specify the currency
2nd column specifies the address of the thief/attacker
3rd column specifies the brief name of the incident
4th column specifies the URL describing the incident (and thus justifying the presence in the blacklist)

If such a (ideally decentralised) blacklist should be adopted by the most impotant merchants&exchange offices, it would mean for an attacker that he's burnin away his ASIC circuits 4 nothing else than keeping the amount of "non-dirty" coins on a stabilized level, hence raising the value (in comparison with other currencies which inflate by mining) of the coin for all participants of the network except himself

it's called an antiassholebollock positive feedback

[and You can be sure that the copies of the blockchain before the attack are stored on definitely hundred places or so, some offline, so TRC is definitely NOT DEAD, no definitive rewrite of the history could take place, coin is just hibernating]

Milan77

full member

Activity: 202

Merit: 100

Change something or end this bs.

bcp19

hero member

Activity: 532

Merit: 500

Quote from: hromisko on August 08, 2013, 12:39:29 PM

Quote from: smoothie on August 08, 2013, 12:11:52 PM

Quote from: hromisko on August 08, 2013, 12:06:58 PM

Since it seems it continues and I'm getting somewhat pissed off by what is currently going on with TRC, I created a blacklist available here:

http://teracoin.org/blacklist

Which records major past&present acts which I personally consider as contradictory to the spirit of CryptoCoin movement.
The idea was to deploy a full-fledged economy and not a playground for morally crippled criminals, no?

Ideally, in the future, merchants and exchange offices shall simply not accept coins which have ever passed through such dirty addresses.

Perhaps you should look into the possibilities of exploits with a particular coin before using it?

TRC exploits have been foreseen many months ago, especially the one where ASICs can jack up the difficulty at a moments notice.

Dear smoothie,

Existence of exploits is not my concern. Since it has been long ago postulated by many wise persons whose opinion I respect that EVERY SYSTEM IS EXPLOITABLE (BTC included, of course), I personally consider it to be a waste of time to give a big fck about exploits. What interests me, however, especially in this stage of CryptoCoin paradigm shift, is to propose robust reactive mechanism against immoral usage of such exploits.

Blacklist whose URL is above is my minute contribution to such a mechanism.

(a propos, many [ c.f. https://bitcointalksearch.org/topic/m.30913 ] things were "foreseen" months before You even registered to this forum, thus if I were You I would be somewhat reluctant in making definitive statements from such a distinguished supervisory pose)

Maybe you can reformat your page? All I see is 1 long continuous line of garble that makes no sense.

hromisko

newbie

Activity: 8

Merit: 0

Quote from: smoothie on August 08, 2013, 12:11:52 PM

Quote from: hromisko on August 08, 2013, 12:06:58 PM

Since it seems it continues and I'm getting somewhat pissed off by what is currently going on with TRC, I created a blacklist available here:

http://teracoin.org/blacklist

Which records major past&present acts which I personally consider as contradictory to the spirit of CryptoCoin movement.
The idea was to deploy a full-fledged economy and not a playground for morally crippled criminals, no?

Ideally, in the future, merchants and exchange offices shall simply not accept coins which have ever passed through such dirty addresses.

Perhaps you should look into the possibilities of exploits with a particular coin before using it?

TRC exploits have been foreseen many months ago, especially the one where ASICs can jack up the difficulty at a moments notice.

Dear smoothie,

Existence of exploits is not my concern. Since it has been long ago postulated by many wise persons whose opinion I respect that EVERY SYSTEM IS EXPLOITABLE (BTC included, of course), I personally consider it to be a waste of time to give a big fck about exploits. What interests me, however, especially in this stage of CryptoCoin paradigm shift, is to propose robust reactive mechanism against immoral usage of such exploits.

Blacklist whose URL is above is my minute contribution to such a mechanism.

(a propos, many [ c.f. https://bitcointalksearch.org/topic/m.30913 ] things were "foreseen" months before You even registered to this forum, thus if I were You I would be somewhat reluctant in making definitive statements from such a distinguished supervisory pose)

smoothie

legendary

Activity: 2492

Merit: 1473

LEALANA Bitcoin Grim Reaper

Quote from: hromisko on August 08, 2013, 12:06:58 PM

Since it seems it continues and I'm getting somewhat pissed off by what is currently going on with TRC, I created a blacklist available here:

http://teracoin.org/blacklist

Which records major past&present acts which I personally consider as contradictory to the spirit of CryptoCoin movement.
The idea was to deploy a full-fledged economy and not a playground for morally crippled criminals, no?

Ideally, in the future, merchants and exchange offices shall simply not accept coins which have ever passed through such dirty addresses.

Perhaps you should look into the possibilities of exploits with a particular coin before using it?

TRC exploits have been foreseen many months ago, especially the one where ASICs can jack up the difficulty at a moments notice.

hromisko

newbie

Activity: 8

Merit: 0

Since it seems it continues and I'm getting somewhat pissed off by what is currently going on with TRC, I created a blacklist available here:

http://teracoin.org/blacklist

Which records major past&present acts which I personally consider as contradictory to the spirit of CryptoCoin movement.
The idea was to deploy a full-fledged economy and not a playground for morally crippled criminals, no?

Ideally, in the future, merchants and exchange offices shall simply not accept coins which have ever passed through such dirty addresses.

RoadTrain

legendary

Activity: 1386

Merit: 1009

Quote from: RoadTrain on July 26, 2013, 11:11:45 PM

This is the attacker's address.

Code:

1PAnMKuTs9R4U9FF7xdQSmQc655d2r9zeB

And here you can see it's current balance: http://trc.cryptocoinexplorer.com/chain/Terracoin/q/addressbalance/1PAnMKuTs9R4U9FF7xdQSmQc655d2r9zeB
It's 131119.8705 currently.

As an attacker seems to have enough hashrate for 51% he can continue manipulating difficulty even after halving is removed.
The easiest way to lower difficulty is creating a specific chain of blocks. As actual spacing is limited to 1.5 * 2min = 3 minutes when calculating EMA, an attacker needs to make every second block 3 min in the future from previous, and the make next block in the past. By creating such a chain of blocks where even blocks are in th future and uneven are in the past he can manupulate the difficulty down.

This is because when actual spacing between blocks is negative, terracoin assumes it to be 2 min so it doesn't affect retargeting.
Look here if you want:
https://github.com/terracoin/terracoin/blob/master/src/main.cpp#L1160

PS. It's what I got from sources, if I am mistaken please let me know.

Seems that they use this exploit now.
Is it the attacker's address?
13fcjC81VzihkYPhkJrNyi2eQKzDaUzA2F
http://trc.cryptocoinexplorer.com/chain/Terracoin/q/addressbalance/13fcjC81VzihkYPhkJrNyi2eQKzDaUzA2F
There's one more address that started mining today: 1MLxxvrHF3bHkW1ti7juj4fxqzd7ym8hXQ

roy7

sr. member

Activity: 434

Merit: 250

Version -46 is mandatory in 10K or so blocks. (Should be final update.)

http://sourceforge.net/mailarchive/message.php?msg_id=31258292

DeathAndTaxes

donator

Activity: 1218

Merit: 1079

Gerald Davis

Quote from: ?? on ??

Quote from: STT on July 31, 2013, 10:03:39 PM

Quote from: ?? on ??

Quote from: Chronikka on July 31, 2013, 04:21:37 PM

...but for what purpose would they need the coins if they wanted it dead?

My point exactly, they don't want it dead.

Keep in mind this is all just tin foil hat speculation

~BCX~

aha now I know who

http://youtu.be/UwKryuazNMk?t=22s

No this is the best clip of Khan

http://youtu.be/v7WlyuI7xGI

~BCX~

Liar.

http://www.youtube.com/watch?v=gsYT8YHL-R0

or

http://www.youtube.com/watch?v=LaVIIoRKBlk (starting at 5:30)

Quote

"Surely I have made my meaning plain, I mean to avenge myself upon you. I deprived your ship of power and when I come about I mean to deprive you of your life."

Who am I kidding, there isn't a single line Khan said that isn't pure gold.

STT

legendary

Activity: 4088

Merit: 1452

Quote from: ?? on ??

Quote from: Chronikka on July 31, 2013, 04:21:37 PM

...but for what purpose would they need the coins if they wanted it dead?

My point exactly, they don't want it dead.

Keep in mind this is all just tin foil hat speculation

~BCX~

aha now I know who

http://youtu.be/UwKryuazNMk?t=22s

roy7

sr. member

Activity: 434

Merit: 250

Quote from: bcp19 on July 31, 2013, 03:09:51 PM

The only plus side is he seems to be only burst mining and not outright destroying the network like he had been.

Also remember before 175K the difficulty could be forced down to 5k using the exploit. That's why the swing up so high happened, tons of blocks mined at an artificially low difficulty.

Sure he can mine in the valleys, anyone can. And a 51% attack is possible by anyone with enough power. But so far the difficulty has been behaving very well.

Lohoris

hero member

Activity: 630

Merit: 500

Bitgoblin

Quote from: Chronikka on July 31, 2013, 03:19:23 PM

Maybe the attacker didn't want the coin dead.

The coin is dead.

The attacker has demonstrated publicly that he can halt the coin as long as he wants.
Only a fool would still use such a coin --> the coin is dead.

Then there are delusional people that will still use it, and speculators that might be able to exploit those people and earn some real money.

Topic: TERRACOIN ATTACK OVER 1.2TH ATTACK CONFIRMD (Read 28159 times)