[Specs-cx] Binding X.509 subject to /Contract/Party/@id

[nara hideki]

Hi, experts.

I think that there should be rules for binding X.509 subject used to
sign a contract to /Contract/Party/@id.

Two ways came to my mind :

1.  XRD/XRDS discovered for /Contract/Party/@id MUST be signed with
same certificate used to sign contracts.
2.  X.509 should be has a property for the Party/@id.

There could be more or better ones.

Any idea welcome.

Thanks.
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