9

What happened to this transaction?

Can someone explain it?

http://blockexplorer.com/t/9eHTFRi3Qq

11

On July 29 2010, it was discovered that block 71036 contained several transactions with a ton of OP_CHECKSIG commands. There should only ever be one such command. This caused every node to do extra unnecessary work, and it could have been used as a denial-of-service attack. A new version of Bitcoin was quickly released. The new version did not cause a fork on the main network, though it did cause one on the test network (where someone had played around with the attack more).

https://en.bitcoin.it/wiki/Incidents#OP_CHECKSIG_abuse

  • nice link, really worth reading – Mascarpone Oct 5 '11 at 17:37

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