Hi. Based on an action I took this morning I have added the following two references to the Unique Contacts worksheet at (https://docs.google.com/document/d/1meyuNRsq4sMOI6pefJk4jZevaKUsTkVf8_XyW1tRaiA/edit)   

• EWG Final Report Section V. pp 68-80
  
• https://www.icann.org/en/system/files/files/final-report-06jun14-en.pdf
• Specifies a framework for Contact ID’s associated with Purpose Based Contacts.  

• Public Whois Attributes, Securely Hashed (WhASH)
  
• https://www.icann.org/en/system/files/correspondence/jevans-to-marby-et-al-04jun18-en.pdf
• Describes a method for Hashing Point of Contact Details in Public Domain Name Whois

Thanks!

Alex