Please add resources and reference material links below. At the moment, these are in no clear order.
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https://kantara.atlassian.net/wiki/spaces/uma/pages/4849814/UMA+legal+subgroup+notes (and items linked therein)
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https://datatracker.ietf.org/doc/html/rfc8693 (for on-behalf-of semantics)
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https://sovrin.org/a-deeper-understanding-of-implementing-guardianship/ (and items linked therein)
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https://www-smbc-co-jp.translate.goog/kojin/digital-safetybox/service/ (Japanese bank service that allows users to store digital data for disclosure to specified relatives after the owner has deceased.)
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Digital end of life planning from the Japanese National Consumer Affairs Center Register Article, Original Source