Adds FOSSY 23 post

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+# fossy ssi
+
+Yesterday I had the pleasure of presenting my talk
+[Challenges in open, self-sovereign identity][ssi-fossy23] at [FOSSY][fossy23].
+
+It was great to see folks in person again and I'm grateful for the audience
+discussion and participation! There was a great deal of interest in
+how open hardware in the form of [Betrusted][betrusted] / [Precursor][precursor]
+might help users maintain their own private key material.
+
+I'll update this post with a link to the video once it becomes available.
+
+## acknowledgments
+
+I would like to thank Kaliya, Pamela Dingle and Christopher Allen for contributing
+ideas and links on the subject of identity.
+
+## links
+
+* Presentation as PDF: [[fossy_ssi.pdf|fossy_ssi.pdf]]
+
+[ssi-fossy23]: https://2023.fossy.us/schedule/presentation/117/
+[fossy23]: https://2023.fossy.us/
+[betrusted]: https://betrusted.io/
+[precursor]: https://precursor.dev/
+
+[[!tag security ssi identity]]

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