Value overflow incident

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Revision as of 18:18, 6 March 2015 by Taras (talk | contribs) (Taras moved page CVE-2010-5139 to Value overflow incident: Better title)
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1d5e512a9723cbef373b970eb52f1e9598ad67e7408077a82fdac194b65333c9

237fe8348fc77ace11049931058abb034c99698c7fe99b1cc022b1365a705d39-000 0.5 BTC

92,233,720,368.54275808 BTC 1Hk51V49a58fC2r471hScXopEQpioDEuqx
92,233,720,368.54275808 BTC 12vRJXnnA21YAaLacWXpNshy7MBAwrigtQ
0.51 BTC Miner's fee

On August 15 2010, it was discovered that block 74638 contained a transaction that created 184,467,440,737.09551616 bitcoins for three different addresses.[1] Two addresses received 92.2 billion bitcoins each, and whoever solved the block got an extra 0.01 BTC that did not exist prior to the transaction. This was possible because the code used for checking transactions before including them in a block didn't account for the case of outputs so large that they overflowed when summed.[2] A new version of the client was published within five hours of the discovery. The block chain was forked. Although many unpatched nodes continued to build on the "bad" block chain, the "good" block chain overtook it at a block height of 74691. The bad transaction no longer exists for people using the longest chain. Therefore, the bitcoins created by it do not exist either. While the transaction does not exist anymore, the 0.5 BTC that was consumed by it does. It appears to have come from a faucet and has not been used since.

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