Topic: GHash.IO and double-spending against BetCoin Dice - page 2. (Read 19056 times)

I don't know how to analyze the blockchain. But if this is really true, double spending bitcoin is big news.

Hehe, busted

Good job, well done RoadTrain !

Nice forensic research! 

I've already provided everything in the first post.
Blockchain is a public resource, so you can check it yourself.
If you can't understand it, then refrain from calling it bullshit please.

Will be more interesting to request the list of blocks they mined between 25th and 27th of september.
There's no such stats in public.

email from support    

Derrik Goon (CEX.IO)

Oct 31 11:24 (UTC)

Hello uk1,

I would like to inform you that this information you are reading is not accurate, we are a company that does not involve itself in any sort of online gambling, its for the fishes.

Best Regards,
Derrik G.
CEX.IO Support

You support yours.  All I see is FUD.

You should send your findings to their support email - it would be interesting to hear their explanation.....don't hold your breath for a reply though, they're a bit slack in that department I hear. 

Did anyone examine what I provided? Or just nobody cares that the second largest pool is performing double spends?

Support  your statement please.

I call bullshit.

I'm saying ghash.io was likely involved in that double-spending.
I got a report from a pool's user that there were no blocks (rewards) between 25th and 27th of september.
It means that user's hashpower was used for free by pool operators to perform this attack.

So....you're saying Ghash.io is double spending or someone on it?

Transalating my post from russian subforum
https://bitcointalksearch.org/topic/ghashio-betcoin-dice-321444

Like a month ago, in September I witnessed a lot of double-spending against BetCoin Dice. It happened between 25th and 27th Sept.

The mechanism was simple: send betcoin a tx wit 0 fee, then wait for a result tx, if your bet is a win, then confirm your tx, otherwise double-spend it.

1. Here I'll give you a bunch of transactions which you can examine. Note this is a chain of transactions, so just click on outputs to see.
https://blockchain.info/tx/4d731074447f02609c3110a187f9c6976f2bf255288ec5666ee270f09679619d
https://blockchain.info/tx/e0b44f68441ea0bad0f7694f735f496ce05238862534c6fea737b8903921185a

The double-spending of losing bets was performed by someone mining to https://blockchain.info/address/1MA7CKbWMyKdPkmsbnwmfeLh1hYy5A3gy8 , you can check it yourself.

2. I tracked coins down to the origin
https://blockchain.info/tx/154ecb1eb72c933bc0707fa70deceb688361554ab81b901673d308aa84d9cfe9
The most interesting address here is 12PcHjajFJmDqz28yv4PEvBF4aJiFMuTFD
It's been involved in similar actions, look at this chain of win-only tx's
https://blockchain.info/tx/0c1a08d035862b01d075e8044b1e9ce52a8ad951b57d876a2a9a0e3502c41eb0
And the most interesting fact is that these zero-fee tx's inbetween winning ones were mined by ghash.io exclusively. Possibly this was a test attack.

3. Going further, I found the address the earnings from attack were sent to: 12e8322A9YqPbGBzFU6zXqn7KuBEHrpAAv
https://blockchain.info/tx/292e7354fbca1847f0cbdc87a7d62bc37e58e8b6fa773ef4846b959f28c42910
And then part of these funds (125 BTC) was sent to ghash.io's mining address:
https://blockchain.info/tx/48168cf655d0ac0c7c2733288ca72e69ecd515a9a0ab2821087eb33deb7c6962

4. Furthermore, I checked the funds mined to 1MA7CKbWMyKdPkmsbnwmfeLh1hYy5A3gy8
In these 2 succeeding tx's they were moved to 199kVcHrLdouz9k9iW3jh1kpL7j9nLg7pn
https://blockchain.info/tx/e567ad6232de5285e0dc211d3f1c489b1e00e509118ba98a4825529d0a9197d9
https://blockchain.info/tx/faa7bc8b99376efa774045e79b42771fe668341b00290a61cd416992571c590d

This address is interesting, because it contains 6000 BTC and ~30% of funds come from ghash.io mining address.
https://blockchain.info/taint/199kVcHrLdouz9k9iW3jh1kpL7j9nLg7pn

5. And the last thing to spot:
GHash.io, being about 25% of network back then, didn't find a single block to its address between 25th and 27th of september!
https://blockchain.info/address/1CjPR7Z5ZSyWk6WtXvSFgkptmpoi4UM9BC?offset=1350&filter=2


I'm not jumping on conclusions, but these actions require public attention.
Comment here if you have anything to say.