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Topic: Blockchain split of 4 July 2015 - page 25. (Read 45630 times)

legendary
Activity: 994
Merit: 1035
July 03, 2015, 10:18:38 PM
#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.
legendary
Activity: 1862
Merit: 1004
July 03, 2015, 10:17:15 PM
#7
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?
legendary
Activity: 966
Merit: 1001
July 03, 2015, 10:16:30 PM
#6


So it is not just F2Pool, but also AntPool.
Considering that they have roughly 36% of total network hashrate (data from https://blockchain.info/pools), it shouldn't be hard for the "correct chain" to win.
sr. member
Activity: 484
Merit: 251
July 03, 2015, 10:13:27 PM
#5
Meanwhile 1mb in transaction on queue https://blockchain.info/unconfirmed-transactions
legendary
Activity: 883
Merit: 1005
July 03, 2015, 10:09:20 PM
#4
More info plz

Edit: what do you mean by fake confirmations?
legendary
Activity: 1302
Merit: 1008
Core dev leaves me neg feedback #abuse #political
July 03, 2015, 10:09:16 PM
#3
Is this for real? A fork would be a big deal.



why is it a big deal?  don't orphan chains happen regularly and get resolved ?
legendary
Activity: 1302
Merit: 1008
Core dev leaves me neg feedback #abuse #political
July 03, 2015, 10:04:45 PM
#2
interesting,let's see how deep the reorg will be. 
legendary
Activity: 1792
Merit: 1111
July 03, 2015, 09:52:54 PM
#1
F2Pool is building on a wrong side and there is fake confirmation since block 363731. (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: https://bitcoin.org/en/alert/2015-07-04-spv-mining
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