12 Mar '13, 10pm

Bitcoin Network Shaken by Blockchain Fork #bitcoin

What had happened was the following. The latest version 0.8 release of bitcoind, by far the most popular implementation of Bitcoin used by miners, switched the database that it used to store blocks and transactions from BerkeleyDB to the more efficient LevelDB as part of an effort to reduce blockchain synchronization time. However, what the developers did not realize at the time was that by doing so they also accidentally introduced a change to the rules of the Bitcoin protocol. In order to make an update to the database, the database process must make a “lock” on the part of the database which stores that particular item of information, a mechanism implemented to prevent two changes from occurring simultaneously and accidentally corrupting the database. In a b-tree, the data structure used by BerkeleyDB to store objects, two locks are required per update. However, Berkele...

Full article: http://bitcoinmagazine.com/bitcoin-network-shaken-by-bloc...

Tweets

Bitcoin Blockchain Forked By Backward-Compatibi...

it.slashdot.org 12 Mar '13, 12pm

"The Bitcoin blockchain has forked due to a lurking backward-compatibility issue : versions older than 0.8 do not properly...

fork?

reddit.com 12 Mar '13, 1am

Join bitcoin-dev for further updates (please don't pester while people work). Looks like the chain was forked by a bug in ...

More info on the #bitcoin chain fork:

bitcoin.org 12 Mar '13, 3am

11/12 March 2013 Chain Fork Information What happened A bitcoin miner running version 0.8.0 created a large block (at heig...

Breaking: Disagreement Between Bitcoin Clients Generates Fork

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