jl2012



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LegendaryActivity: 1792Merit: 1010 Blockchain split of 4 July 2015 July 04, 2015, 02:52:54 AM

Last edit: July 04, 2015, 02:50:09 PM by jl2012 #1 EDIT: the bogus chain of 363731 is already orphaned and not relevant to normal users )



If you use light weight wallet or old version of Bitcoin Core, you should stop accepting bitcoin for a moment



EDIT: For people looking for latest advice, please see the header of the forum. If you see no warning in the forum header, you may assume business back to normal



EDIT: More details: F2Pool is building on a wrong side and there is fake confirmation since block 363731. (If you use light weight wallet or old version of Bitcoin Core, you should stop accepting bitcoin for a momentEDIT: More details: https://bitcoin.org/en/alert/2015-07-04-spv-mining Donation address: 374iXxS4BuqFHsEwwxUuH3nvJ69Y7Hqur3 (Bitcoin ONLY)

LRDGENPLYrcTRssGoZrsCT1hngaH3BVkM4 (LTC)

PGP: D3CC 1772 8600 5BB8 FF67 3294 C524 2A1A B393 6517

Quantus



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LegendaryActivity: 883Merit: 1004 Re: WARNING: blockchain split July 04, 2015, 03:09:20 AM #4 More info plz



Edit: what do you mean by fake confirmations?

Avoid the XT shills, they only want to destroy bitcoin, their hubris and greed will destroy us.

Know your adversary (I am a 1MB block supporter who thinks all users should be using Full-Node clients)Avoid the XT shills, they only want to destroy bitcoin, their hubris and greed will destroy us.Know your adversary https://www.youtube.com/watch?v=BKorP55Aqvg

Slark



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LegendaryActivity: 1848Merit: 1004 Re: WARNING: blockchain split July 04, 2015, 03:17:15 AM #7 Quote from: jl2012 on July 04, 2015, 02:52:54 AM F2Pool is building on a wrong side and there is fake confirmation since block 363731.



If you use light weight wallet or with old version of Bitcoin Core, you should stop accept bitcoin for a moment

I am using Bitcoin Core (old version, yes I am lazy and paranoid). So basically you are saying if I start my wallet now and it update blockchain it will be corrupted and I will lose access to my coins?

I am using Bitcoin Core (old version, yes I am lazy and paranoid). So basically you are saying if I start my wallet now and it update blockchain it will be corrupted and I will lose access to my coins?

BitUsher



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LegendaryActivity: 994Merit: 1027 Re: WARNING: blockchain split July 04, 2015, 03:18:38 AM #8 https://www.reddit.com/r/Bitcoin/comments/3c2cfd/psa_f2pool_is_mining_invalid_blocks/



Quote from: Peter Todd tl;dr: of what's going on:



A large % of the hashing power is "SPV mining" where they mine on top of headers from blocks that they haven't actually verified. They're do this because in most cases you earn more money doing it - latency matters a lot and even 1MB blocks take long enough to propagate that you lose a significant amount of money by waiting for full propagation.



However, this also means they're not checking the new BIP66 rule, and are now mining invalid blocks because of it. (another miner happened to create an invalid, non-BIP66 respecting block) If you're not using Bitcoin Core, you might be accepting transactions that won't be on the longest valid chain when all this is fixed.



Bitcoin Core (after 0.10.0) rejects these invalid blocks, but a lot of other stuff doesn't. SPV Bitcoinj wallets do no validation what-so-ever, blindly following the longest chain. blockchain.info doesn't appear to do validation as well; who knows what else?



edit: FWIW, this isn't a BIP66-specific issue: any miner producing an invalid block for any reason would have triggered this issue.



BitUsher



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LegendaryActivity: 994Merit: 1027 Re: WARNING: blockchain split July 04, 2015, 03:23:13 AM #11 Quote from: Slark on July 04, 2015, 03:17:15 AM

I am using Bitcoin Core (old version, yes I am lazy and paranoid). So basically you are saying if I start my wallet now and it update blockchain it will be corrupted and I will lose access to my coins?





You run a risk of losing your coins if you perform a transaction at the moment on anything but Bitcoin Core 0.10.0 or newer. Starting up your wallet is fine though.



If you are using Bitcoin Core 0.10.0 or newer you will be safe for performing txs at the momment You run a risk of losing your coins if you perform a transaction at the moment on anything but Bitcoin Core 0.10.0 or newer. Starting up your wallet is fine though.If you are using Bitcoin Core 0.10.0 or newer you will be safe for performing txs at the momment

OROBTC



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LegendaryActivity: 1932Merit: 1102 Re: WARNING: blockchain split July 04, 2015, 03:27:01 AM #12 ...



Just saw that myself at blockchain.info and came over here for an explanation, right place!



Chinese miners ought to take care not to screw the pooch through selfishness or whatever.



Very unusual things happening are often a bad sign. I will not do ANY transactions until we get some clarity.

Quantus



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LegendaryActivity: 883Merit: 1004 Re: WARNING: blockchain split July 04, 2015, 03:34:24 AM #13 So the Chines miners are creating invalid blocks but smart phone wallets and even website wallets can't tell they are invalid?

Avoid the XT shills, they only want to destroy bitcoin, their hubris and greed will destroy us.

Know your adversary (I am a 1MB block supporter who thinks all users should be using Full-Node clients)Avoid the XT shills, they only want to destroy bitcoin, their hubris and greed will destroy us.Know your adversary https://www.youtube.com/watch?v=BKorP55Aqvg

BitUsher



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LegendaryActivity: 994Merit: 1027 Re: WARNING: blockchain split July 04, 2015, 03:35:58 AM #14 Interesting test case for alert being sent out to older version of Bitcoin Core to warn users.(Prior to 0.10). I have various cores installed on different computers and do not see the alert on any of them.



As far as I am aware 3 people have alert keys - Gavin, Satoshi, and Theymos. Why isn't an alert being sent out?

Quantus



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LegendaryActivity: 883Merit: 1004 Re: WARNING: blockchain split July 04, 2015, 03:37:27 AM #16 So many people are going to get scammed tonight with fake transactions.

Avoid the XT shills, they only want to destroy bitcoin, their hubris and greed will destroy us.

Know your adversary (I am a 1MB block supporter who thinks all users should be using Full-Node clients)Avoid the XT shills, they only want to destroy bitcoin, their hubris and greed will destroy us.Know your adversary https://www.youtube.com/watch?v=BKorP55Aqvg

OROBTC



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LegendaryActivity: 1932Merit: 1102 Re: WARNING: blockchain split July 04, 2015, 03:38:45 AM #17



Been over 30 minutes since the 5 suspicious blocks...



Um, an interesting way to spend a Friday night?



* * *



turtlehurricane, a PM for you. That phone number of yours seems to place you near me.











EDIT: Has anyone checked the other blockchain tools? blockexplorer appears to be down / not working. ...Been over 30 minutes since the 5 suspicious blocks...Um, an interesting way to spend a Friday night?* * *, a PM for you. That phone number of yours seems to place you near me.EDIT: Has anyone checked the other blockchain tools? blockexplorer appears to be down / not working.