Two Records of One History: census and pair list of the duplicated 2009-2010 commits in bitcoin/bitcoin

The census and pair list of the duplicated 2009-2010 commits in the bitcoin/bitcoin repository on GitHub: 132 same-first-line pairs, holding 264 of the 341 non-merge commits of 30 August 2009 to 31 December 2010, with both copies' hash, date, author string, git-svn-id trailer, Subversion revision, additions and deletions, the pair type, the outcome of a change-statistics test and the offset in days; the census summary of 20 September 2026; the standard-library script that regenerates the summary and the comparison; and the laboratory note that first reported the doubling, at its revision of 25 September 2026, which carries its own correction block. Produced from GitHub's commit records on 20 September 2026. Note on the counts: the census reports 385 commits on the default-branch history and 42 merges; 385 minus 42 is 343, and the two further commits are the parentless roots, which the census excludes because it selects commits with exactly one parent. Licences: the data and the note are CC BY 4.0; the script is MIT, the licence of the repository it is copied from, and the archive's LICENSE file states which covers which.