This extension is used to describe processing history of both assets and the STAC metadata. For STAC metadata, the software that was used to create the data is often public (at least in part). We could provide more guidance/structure around how to provide that information. I haven't fully thought this through, but that might look like this:
Field Name Type Description processing:software List<Software> Software that was used to create assets or the STAC object itself, in order from the first software used to the last
And then the Software object:
stactools-landsat href string An href to the source code, e.g. https://github.com/stactools-packages/landsat. This could also be the href from a package management system, e.g. https://pypi.org/project/stactools-landsat/ version string A version identifier, e.g. v1.2.3. This could also be an SHA from a version control system, e.g. 6dcb09b5b57875f334f61aebed695e2e4193db5e
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