TERRACOIN ATTACK OVER 1.2TH ATTACK CONFIRMD

[Trillium]

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?

 

[CoinEraser]

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/

[roy7]

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.

[bitcoinreactor]

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)

[Trillium]

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.

[clockuniverse]

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://bitcointalk.org/index.php?topic=1364146.0