Attention ALL Stratum pool Admins!

[ahmed_bodi]

they are and the stratum and sha algorithm's do. these idiot's using stratum without checking the diff1 are at fault and its their responability. it 100% isnt a fault in my code at all. i take responsability for scrypt and sha any other algo is up the user as i dont know myself how to calc what a diff1 value should be

[bitcoyim]

they are and the stratum and sha algorithm's do. these idiot's using stratum without checking the diff1 are at fault and its their responability. it 100% isnt a fault in my code at all. i take responsability for scrypt and sha any other algo is up the user as i dont know myself how to calc what a diff1 value should be

this is absolutely right

[BorisTheSpider]

Hello everyone,

I'm trying to understand this stratum exploit better, and something is confusing me.

The lowest difficulty is defined by the biggest target. So if we look at the nBits of the genesis block, we then convert to hex (from the compact representation) to get the diff 1 targets.

In BTC, genesis.nBits    = 0x1d00ffff;

https://en.bitcoin.it/wiki/Difficulty suggests we convert to a hex representation like:

so the hex target is
0x00ffff * 2**(8*(0x1d - 3))
or
0000 0000 ffff 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000

Which matches https://github.com/Crypto-Expert/stratum-mining/blob/master/lib/template_registry.py where for sha256

diff1 = 0x00000000ffff0000000000000000000000000000000000000000000000000000

Now looking at a scrypt coin, eg LTC:

0x1e0ffff0 is the genesis block nbits

so the hex target is

0x0ffff0 * 2**(8*(0x1e - 3))
or
0000 0fff f000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000

Which doesn't match stratum-mining

 if settings.COINDAEMON_ALGO == 'scrypt' or 'scrypt-jane':
            diff1 = 0x0000ffff00000000000000000000000000000000000000000000000000000000

ie. the stratum-mining code has 4 leading zeros in the 64 byte hex representation of the target, wheras I get 5 leading zeros when doing the conversion from the compact to the full hex representation of the max difficulty.

I'm sure stratum-mining must be correct  - where am I going wrong?

[azhago]

On stablehash Groestl, someone take 99% of all rewards, sending thousands shares while other send 5 or 6.. Look at the invalide rate too..



I don't think this guy find any block too, but in anonymous, we can't verify..

There is some exploit out there..

[Coindgr]

On stablehash Groestl, someone take 99% of all rewards, sending thousands shares while other send 5 or 6.. Look at the invalide rate too..



I don't think this guy find any block too, but in anonymous, we can't verify..

There is some exploit out there..

Pool owners should ban this kind of hashrate. If it was real, he could be solomining.

[doge94]

On stablehash Groestl, someone take 99% of all rewards, sending thousands shares while other send 5 or 6.. Look at the invalide rate too..



I don't think this guy find any block too, but in anonymous, we can't verify..

There is some exploit out there..

Pool owners should ban this kind of hashrate. If it was real, he could be solomining.

This person has been banned. He only made ~30k MYR before I banned him.

[thekidcoin]

Could something like this combined with say a pool with 50% + of the network hashrate (at times up to 75%) cause a blockchain to stall, say for 1 1/2 hours at times with no found block?

At my last straw here LOL