[NSFW] Official Sexcoin Thread - New MANDATORY upgrade: KGW Timewarp attack FIX

[lavajumper]

From my phone
I'm not worried about hash rate for the network. Just waiting for next retarget

Back to RL....

[lavajumper]

Looks like I can't do high school math anymore.

*Blushing horrifically*

Ok we're going to go with 60 block retarget for now.

The good news is I hit all the right spots.

[LittleDigger]

Ok guys lets give it to you straight...

The retargeting is wrong... we've gotten together discussed it on IRC and are organising to take care of it.

We have said that we were going to issue two hardforks from the start which is fortunate, it means that we can fix it quickly, and we'll do an official announcement explaining what exactly went wrong.. Unfortunately we are moving our planned next mandatory client release forward to next week end so you'll have to upgrade again.. we are looking to make it so you'll have two weeks to upgrade.

The basic problem is we should be popping blocks every 60 seconds with a 30 block retarget. Instead we are on 30 second blocks with a 60 block difficulty retarget.. We are all mining at double rewards.

As embarrassing as it is, we've always played it straight, believing that honesty is the best policy, so we admit that we screwed up.

And we've decided that the thirty second blocks give us a competitive edge, the 60 second block retarget still gives us half hourly retargets so.. We are keeping them..

We will reduce the the rewards for blocks by half, and change the block halving to suit..

We know how incompetant this makes us look, but we are willing to wear the blame, and the damage is that miners will be getting more coins for about the next three weeks, and the price will probably drop due to the higher amount of coins hitting the exchanges.. Hopefully it will rebound at the next hardfork.

We know that this is a pain in the ass, but this should be the last mandatory update we need to issue, and the community knew we were doing another one so hopefully it will proceed smoothly.
 

[rpg]

Ok guys lets give it to you straight...

The retargeting is wrong... we've gotten together discussed it on IRC and are organising to take care of it.

We have said that we were going to issue two hardforks from the start which is fortunate, it means that we can fix it quickly, and we'll do an official announcement explaining what exactly went wrong.. Unfortunately we are moving our planned next mandatory client release forward to next week end so you'll have to upgrade again.. we are looking to make it so you'll have two weeks to upgrade.

The basic problem is we should be popping blocks every 60 seconds with a 30 block retarget. Instead we are on 30 second blocks with a 60 block difficulty retarget.. We are all mining at double rewards.

As embarrassing as it is, we've always played it straight, believing that honesty is the best policy, so we admit that we screwed up.

And we've decided that the thirty second blocks give us a competitive edge, the 60 second block retarget still gives us half hourly retargets so.. We are keeping them..

We will reduce the the rewards for blocks by half, and change the block halving to suit..

We know how incompetant this makes us look, but we are willing to wear the blame, and the damage is that miners will be getting more coins for about the next three weeks, and the price will probably drop due to the higher amount of coins hitting the exchanges.. Hopefully it will rebound at the next hardfork.

We know that this is a pain in the ass, but this should be the last mandatory update we need to issue, and the community knew we were doing another one so hopefully it will proceed smoothly.
 

add a poison pill for sudden hash increases

[LittleDigger]

Ok guys lets give it to you straight...

The retargeting is wrong... we've gotten together discussed it on IRC and are organising to take care of it.

We have said that we were going to issue two hardforks from the start which is fortunate, it means that we can fix it quickly, and we'll do an official announcement explaining what exactly went wrong.. Unfortunately we are moving our planned next mandatory client release forward to next week end so you'll have to upgrade again.. we are looking to make it so you'll have two weeks to upgrade.

The basic problem is we should be popping blocks every 60 seconds with a 30 block retarget. Instead we are on 30 second blocks with a 60 block difficulty retarget.. We are all mining at double rewards.

As embarrassing as it is, we've always played it straight, believing that honesty is the best policy, so we admit that we screwed up.

And we've decided that the thirty second blocks give us a competitive edge, the 60 second block retarget still gives us half hourly retargets so.. We are keeping them..

We will reduce the the rewards for blocks by half, and change the block halving to suit..

We know how incompetant this makes us look, but we are willing to wear the blame, and the damage is that miners will be getting more coins for about the next three weeks, and the price will probably drop due to the higher amount of coins hitting the exchanges.. Hopefully it will rebound at the next hardfork.

We know that this is a pain in the ass, but this should be the last mandatory update we need to issue, and the community knew we were doing another one so hopefully it will proceed smoothly.
 

add a poison pill for sudden hash increases

Can you elaborate on that ?

[Mytche]

add a poison pill for sudden hash increases

It seems to me that a poison pill would make the changes in difficulty larger not smaller.  There are 2 obvious ways to smooth out difficulty shorten adjustment period or make only fractional adjustments.  I think 30 or 60 block adjustments will work fine.  Anything > 5 min and < 1 hour seems pretty solid.  Fractional adjustments would also work if you did say a geometric mean of the previous 2 targets with a double weight on the new target.  This can mess with the time a bit.  You probably could even use the same concept as pools use for PPLNS on difficulty adjustments.

[LittleDigger]

Correction, Lava was against the faster block time, and it looks like he was right..
From the stats it looks like half the miners are hashing along nicely, but it's reject city for others..

My reject rate is 90%, but I'm on a really really lousy connection with inbuilt lag (VSAT)

[lavajumper]

add a poison pill for sudden hash increases

It seems to me that a poison pill would make the changes in difficulty larger not smaller.  There are 2 obvious ways to smooth out difficulty shorten adjustment period or make only fractional adjustments.  I think 30 or 60 block adjustments will work fine.  Anything > 5 min and < 1 hour seems pretty solid.  Fractional adjustments would also work if you did say a geometric mean of the previous 2 targets with a double weight on the new target.  This can mess with the time a bit.  You probably could even use the same concept as pools use for PPLNS on difficulty adjustments.

There's a couple of things that bother me about how the retarget is calculated. One thing is that it only looks at a time frame and # of blocks. So essentially it runs all the calculations from two blocks, the first and the last. I've been working on a routine that inspects all the solves in pairs or triplets, runs a standard deviation on them, and then throws out data thats way out there. After that it would add a small percentage of the 'off the chart' data, to accomodate the flash. This should give a smooth retarget at almost any retarget interval you pick. In flash cases, we would get a difficulty that was a little higher than 'optimal', and during 'normal' times, there would be no difference.

Would someone please explain to me how a poison pill works?

[rpg]

Ok guys lets give it to you straight...

The retargeting is wrong... we've gotten together discussed it on IRC and are organising to take care of it.

We have said that we were going to issue two hardforks from the start which is fortunate, it means that we can fix it quickly, and we'll do an official announcement explaining what exactly went wrong.. Unfortunately we are moving our planned next mandatory client release forward to next week end so you'll have to upgrade again.. we are looking to make it so you'll have two weeks to upgrade.

The basic problem is we should be popping blocks every 60 seconds with a 30 block retarget. Instead we are on 30 second blocks with a 60 block difficulty retarget.. We are all mining at double rewards.

As embarrassing as it is, we've always played it straight, believing that honesty is the best policy, so we admit that we screwed up.

And we've decided that the thirty second blocks give us a competitive edge, the 60 second block retarget still gives us half hourly retargets so.. We are keeping them..

We will reduce the the rewards for blocks by half, and change the block halving to suit..

We know how incompetant this makes us look, but we are willing to wear the blame, and the damage is that miners will be getting more coins for about the next three weeks, and the price will probably drop due to the higher amount of coins hitting the exchanges.. Hopefully it will rebound at the next hardfork.

We know that this is a pain in the ass, but this should be the last mandatory update we need to issue, and the community knew we were doing another one so hopefully it will proceed smoothly.
 

add a poison pill for sudden hash increases

Can you elaborate on that ?

we can discuss the best percentages approach , but if the hash increase lets say 200% from one block to the next you know we're under a flash attack. At that point the diff should increase and not wait for the 60 block retarget. The same way it should retarget down if hash comes down 20% from one block to the next

[LittleDigger]

Correction, Lava was against the faster block time, and it looks like he was right..
From the stats it looks like half the miners are hashing along nicely, but it's reject city for others..

My reject rate is 90%, but I'm on a really really lousy connection with inbuilt lag (VSAT)

Nope just a DDos on me.. I'm kinda flattered they'd take the time to bother...

[lavajumper]

we can discuss the best percentages approach , but if the hash increase lets say 200% from one block to the next you know we're under a flash attack. At that point the diff should increase and not wait for the 60 block retarget. The same way it should retarget down if hash comes down 20% from one block to the next

I hadn't thought of that...intriguing.

[rpg]

we can discuss the best percentages approach , but if the hash increase lets say 200% from one block to the next you know we're under a flash attack. At that point the diff should increase and not wait for the 60 block retarget. The same way it should retarget down if hash comes down 20% from one block to the next

I hadn't thought of that...intriguing.

I'm sure there are more implementations one can think of. With the BTC mining concentrated in a few hands, mostly business, I foresee the future of ALT coins to be very bleak. A coin has to sustain itself in its own universe. The flash dumps remove BTCs from the small traders in the system, small traders that no longer have access to newly mined BTCs. Because of that is important to protect a coin from flash hash and at the same time create a way to spend them

[LittleDigger]

I was having a little trouble mining, but I got around it...

I just added all the pools into cgminer and selected "Load balance" as my strategy instead of "failover"..

From the looks of it, the pools are getting DDOS'ed in a rotateing kind of attack moving one to the other..

It's kinda hard to tell from this end, I'm probably wrong, it could be something on my end, but I'm having far less issues mining now..

[fendlestick]

Official store coming online in 30mins, see you at the ANN.

https://bitcointalk.org/index.php?topic=300570.0

[lavajumper]

Official store coming online in 30mins, see you at the ANN.

https://bitcointalk.org/index.php?topic=300570.0

A word of warning. If you don't like porn, stay away.....

Like...who doesn't like porn!?

Fendle's worked hard on his sites, and on this coin. Give him some clicks!
 
 http://www.cryptoxxx.com
 http://www.cryptosextoys.com

(NSFW)

[lavajumper]

P2Pool is back up.

I have no idea what happened....my whole LAN went nuts last night.

[LittleDigger]

I have no idea either.. at the moment I'm mining just fine, rejects are a little high, but I usually get that on faster coins and a laggy connection... WTF.. ..

Hate it when I've got problems I can't pin down..

[fendlestick]

Maybe it will resolve itself, have you tried turning it off and on again? 

[LittleDigger]

Maybe it will resolve itself, have you tried turning it off and on again? 

I've tried every trick in the book, mining solo, load balanceing (which helped a bit), rebooted everthing, updated everything, tweaked until I could tweak no more, and I was still getting 90% stales..

My browser was pretty slow too..

Suddenly I'm at 5-10% stales.. Just started behaving itself..

I'm going to rationalise that my ISP was screwing around with their stuff, and have finished doing whatever they did.. It'll keep me sane..

Not that I started off high in the sanity department 

[rpg]

Maybe it will resolve itself, have you tried turning it off and on again? 

I've tried every trick in the book, mining solo, load balanceing (which helped a bit), rebooted everthing, updated everything, tweaked until I could tweak no more, and I was still getting 90% stales..

My browser was pretty slow too..

Suddenly I'm at 5-10% stales.. Just started behaving itself..

I'm going to rationalise that my ISP was screwing around with their stuff, and have finished doing whatever they did.. It'll keep me sane..

Not that I started off high in the sanity department 

10% stale is pretty high. On situations like that I use Q=0,S=1,E=2