For well over a year, versions of Bitcoin Core — Bitcoin’s leading software implementation — contained a severe software bug. The bug was fixed with Bitcoin Core 0.16.3 (and 0.17.0rc4), released this week, and the status of the Bitcoin network now appears to be safe, with no harm done. The Bitcoin Core project has since released a full disclosure report, revealing that the bug was even worse than previously thought.
These are the good, the bad and the ugly details about one of Bitcoin Core’s nastiest bugs to date. (But not in that order.)