UCAN specification

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Alan Karp

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Sep 19, 2025, 8:16:40 PM (12 days ago) Sep 19
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I read through it this afternoon (skipping the policy language and crypto heavy sections).  I have some quibbles about the presentation, but the design looks solid from a capability perspective.  

The main thing I think is unnecessary is using DIDs.  They probably went that way because they use long-lived keys instead of a different key pair per certificate.

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Alan Karp

David Nicol

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Sep 23, 2025, 2:19:51 AM (9 days ago) Sep 23
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after pondering the terminology -- one speaks of a "UCAN" as the authorization grant when the term is supposed to mean the network, or the protocol -- I'd like to propose UMAI -- User-Managed Authorization Instrument -- as the thing the holder presents to show authorization to access the resource. Instrument, like a driver's license is an instrument.

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Nothing but net

Alan Karp

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Sep 23, 2025, 12:23:47 PM (9 days ago) Sep 23
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It's been UCAN for a long time.  I doubt they'll agree to change the name.

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Alan Karp


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