A step-by-step tutorial to calculate the SWHIDs as we do in presentations, how it can be calculated locally and how it matches what we find on the archive.
Also it can be nice to reference the code fragment in charge of the SWHID with a SWHID :-)
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Main specs are here: https://docs.softwareheritage.org/devel/swh-model/persistent-identifiers.html
There is the cli steps here: https://docs.softwareheritage.org/devel/swh-model/cli.html
there are some details in https://docs.softwareheritage.org/devel/apidoc/swh.model.identifiers.html
eg. https://docs.softwareheritage.org/devel/apidoc/swh.model.identifiers.html#swh.model.identifiers.directory_identifier
or https://docs.softwareheritage.org/devel/apidoc/swh.model.identifiers.html#swh.model.identifiers.revision_identifier