First, for SOCA's proposal  - here you go.
    http://news.dot-nxt.com/2012/03/12/five-cs-whois-validation-model

No, this is what somebody thinks what that the model is.

I tried to find documentation on it on the SOCA site, but a search
for "validation model" doesn't give a satisfying result. Searching
for "whois validation" gives no results at all.

jaap