Re "checksums are linked in the vote thread”. Are any of those checksums still 
available? The linked by the vote, 
https://dist.apache.org/repos/dist/dev/arrow/apache-arrow-adbc-21-rc0 appears 
to be broken.

To put it another way. Can you prove that the artifact you voted on had hash 
74d9dedd15bce71bfbc5bce00ad1aa91be84623010e2a01e6846343a7acc93e36fb263a08cc8437a9467bf63a2c7aca4b14d413325d5afb96b590408d918b27e.
 If not, we have a provenance problem.

> On Feb 9, 2026, at 11:02 AM, Bryce Mecum <[email protected]> wrote:
> 
> Sorry for any confusion caused, Julian. I didn't mean to imply the
> GitHub URL was the definitive location for the asset and I only linked
> it because I know it's the same artifact as what's uploaded to ASF and
> it was near at hand. I otherwise would've linked to [1].
> 
> Re: the potential policy violations, I can put up a PR to add the
> latest closer.lua URL to [2] which may address your first point and,
> for the second point, the checksums are linked in the vote thread so
> everything looks fine there.
> 
> [1] 
> https://archive.apache.org/dist/arrow/apache-arrow-adbc-21/apache-arrow-adbc-21.tar.gz
> [2] https://arrow.apache.org/adbc/current/driver/installation.html
> 
> On Mon, Feb 9, 2026 at 10:14 AM Julian Hyde <[email protected]> wrote:
>> 
>> Where is the definitive location for the ADBC 21 source tarball? It should 
>> be on ASF infrastructure, not GitHub.com <http://github.com/>.
>> 
>> We may have a couple of policy violations here. The release announcement for 
>> ADBC 21 [1] does not link to any permanent location for downloads. And the 
>> SHA512 for the tarball does not appear anywhere in the vote thread for the 
>> release [2].
>> 
>> We should not be trying to construct the provenance of a release using 
>> circumstantial evidence such as "On *Dec 14, 2025 at 7:46 AM EST*, the 
>> SHA512 checksum for that file was …"
>> 
>> Julian
>> 
>> [1] https://lists.apache.org/thread/dpxqpory5pmd119j85ks7cq9prword9p
>> [2] https://lists.apache.org/thread/mx2bwkbx51hy8robpnqksw93hrqzhtp9
>> 
>>> On Feb 9, 2026, at 9:17 AM, Bryce Mecum <[email protected]> wrote:
>>> 
>>> Hey Rusty,
>>> 
>>> I think the URL you shared is the source archive for the git tag and
>>> not the release artifact. If I remember correctly, GitHub has had
>>> issues with checksum stability with those URLs in the past and, while
>>> the situation has gotten better, we recommend only using the release
>>> artifacts anyway [1]. If [1] isn't hash stable, let us know.
>>> 
>>> [1] 
>>> https://github.com/apache/arrow-adbc/releases/download/apache-arrow-adbc-21/apache-arrow-adbc-21.tar.gz
>>> 
>>> On Mon, Feb 9, 2026 at 7:30 AM Rusty Conover <[email protected]> wrote:
>>>> 
>>>> Hi Arrow Friends,
>>>> 
>>>> Apologies in advance if this is the wrong mailing list or if I’m missing 
>>>> something obvious — but I’ve run into something odd with the 
>>>> `apache-arrow-adbc-21.tar.gz` release artifact.
>>>> 
>>>> I’ve been building ADBC via vcpkg as part of my `adbc_scanner` DuckDB 
>>>> extension, using the following source archive:
>>>> 
>>>> https://github.com/apache/arrow-adbc/archive/apache-arrow-adbc-21.tar.gz
>>>> 
>>>> On *Dec 14, 2025 at 7:46 AM EST*, the SHA512 checksum for that file was:
>>>> 
>>>> `74d9dedd15bce71bfbc5bce00ad1aa91be84623010e2a01e6846343a7acc93e36fb263a08cc8437a9467bf63a2c7aca4b14d413325d5afb96b590408d918b27e
>>>> `
>>>> I know this definitively because that hash is recorded in my vcpkg overlay 
>>>> file, and CI completed successfully at the time.
>>>> 
>>>> Since then, however, the SHA512 checksum for the same URL now resolves to:
>>>> 
>>>> `2c15c67d12b6b5ceafdd284038bff71136bac24b9aff1791ed0657e0f0a56ca713e641f9d1032918179af6c387762491c022f43d32995f94a749a60c7b91f20b
>>>> `
>>>> This is currently causing reproducible CI failures on the `v1.4` branch of 
>>>> my extension, which you can see starting here:
>>>> 
>>>> https://github.com/Query-farm/adbc_scanner/actions?page=5
>>>> 
>>>> Did I miss an announcement, or was the release artifact rebuilt or 
>>>> replaced after the initial publication?
>>>> 
>>>> Thanks in advance for any clarification, and sorry again if this is my 
>>>> fault.
>>>> 
>>>> Best wishes,
>>>> 
>>>> Rusty
>>>> --
>>>> https://query.farm
>>>> 
>> 

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