Re: Proof of Possession -How?

On 2016-05-04 05:02, Manu Sporny wrote:
> On 04/29/2016 04:58 AM, Anders Rundgren wrote:
>> I may be stupid but I can't find any method (like a private key) for
>>  binding a person to a credential in the documents I have skimmed.
>
> The mechanism used is via a combination of Linked Data Signatures and
> the WebDHT. Here's a use case:
>
<snip>
>
> Doing these steps proves:
>
> 1. That the US Government says did:90096afc-c232-4b96-b48c-dcdba19b7ead
>    is a US citizen (via the digital signature).
> 2. That I am did:90096afc-c232-4b96-b48c-dcdba19b7ead because I
>    digitally signed something to you when I handed my credential over
>    to you.
>
> That's how you do proof of possession in the Credentials ecosystem.

Then there's only one thing left which I don't understand: Where is the private
key used in step #2?

Anders