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Re: did:key questions (was: DHS SVIP Blockchain/DLT/SSI Cohort - Multi-Product Phase 1 Interop Artifacts/ Scaffolding / Information)

From: Manu Sporny <msporny@digitalbazaar.com>
Date: Fri, 12 Jun 2020 09:08:30 -0400
To: public-credentials@w3.org
Message-ID: <635ae3d9-def8-1980-07a0-c3ae9143aff9@digitalbazaar.com>
On 6/12/20 8:28 AM, Dan Bolser wrote:
> Just reading this:
> https://w3c-ccg.github.io/did-method-key/
> 
> Which looks nice, but I don't understand how resolution from DID to DID
> doc happens.
> 
>     The creation of a DID Document is also performed by taking the
>     public key value and expanding it into DID Document

Hi Dan, I'm one of the Editors for that specification. I'm going to
attempt to answer your questions below:

> Ah... is the DID doc just a version of the key in a different format?

Yes, more or less. The DID Document is deterministically generated from
the DID. The goal of did:key is to be THE simplest and easiest to
implement DID Method.

> e.g. no other fields except those directly derived from the key are allowed?

Yes.

> Sorry if that's obvious (sorry if this is a dumb question).

No dumb questions... and this is a very good question and gets to the
heart of what did:key is about.

> In this sense it's essentially a 'mock' or 'placeholder' DID document?

I wouldn't say it's a 'mock' or 'placeholder' DID document. It is a
bonafide DID Document that can be used in production systems that don't
require key rotation. For example, very useful in test environments and
systems that use short lived DIDs (throw-away pairwise relationships, etc.).

-- manu

-- 
Manu Sporny - https://www.linkedin.com/in/manusporny/
Founder/CEO - Digital Bazaar, Inc.
blog: Veres One Decentralized Identifier Blockchain Launches
https://tinyurl.com/veres-one-launches
Received on Friday, 12 June 2020 13:08:45 UTC

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