W3C home > Mailing lists > Public > public-credentials@w3.org > September 2017

Re: Verifiable Claims expiration

From: Moses Ma <moses.ma@futurelabconsulting.com>
Date: Sat, 16 Sep 2017 12:54:54 -0700
To: Adam Sobieski <adamsobieski@hotmail.com>, David Chadwick <d.w.chadwick@kent.ac.uk>
Cc: "public-credentials@w3.org" <public-credentials@w3.org>
Message-ID: <c488f4a5-a7d7-4d86-cfda-4b3b4b44e8d7@futurelabconsulting.com>
Maybe we should ask Manu, as the definition is not complete.

My thought is that for commercial attestations –– like a bank's 
reference to a rental agency checking a prospective renter's credit to 
offer proof of existence of a savings account ––  or a professional 
certification like a nursing qualification, the default is more likely 
one year. Diplomas and news reports that attempt to set "objective 
truth" should default to "never expire". So I think we need to set up 
some global constants that reflect this variation.

By the way, on the topic of selective disclosure, the example of a bank 
offering a balance check for a prospective renter is useful. It would 
make sense for the bank to issue a single VC, with varying levels of 
information for different reviewers - the rental agency doing check 
usually receives a statement like "the subject has had a savings account 
with us for seven years with a modest four figure average balance", but 
a credit card company will want more info like "the subject opened a 
savings account with us on 9/23/2009 and has had an average balance of 
$4500 and 3 overdrafts over the last 12 months".


On 9/16/17 12:34 PM, Adam Sobieski wrote:
> Moses,
> I thought that omission of the expires property 
> (https://w3c.github.io/vc-data-model/#expiration) results in an 
> open-ended or non-expiring claim or statement.
> Best regards,
> Adam
> *From:* Moses Ma <mailto:moses.ma@futurelabconsulting.com>
> *Sent:* ‎Saturday‎, ‎September‎ ‎16‎, ‎2017 ‎3‎:‎08‎ ‎PM
> *To:* Adam Sobieski <mailto:adamsobieski@hotmail.com>, David Chadwick 
> <mailto:d.w.chadwick@kent.ac.uk>
> *Cc:* public-credentials@w3.org <mailto:public-credentials@w3.org>
> About the expiration of a claim (4.3 in the data model) which is 
> formatted as a date...
> An expiration date is good for drivers licenses, commercial 
> attestations and academic certifications, but shouldn't we include a 
> global constant like NEVER_EXPIRE, so news statements can be 
> explicitly non-expiring?
> Moses
> -
> *Moses Ma *
> moses.ma@futurelabconsulting.com
> v +1.415.952.7888 <tel:+1.415.952.7888> | m +1.415.568.1068 
> <tel:+1.415.568.1068> | skype mosesma


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Received on Saturday, 16 September 2017 19:55:20 UTC

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