> For the complete documentation index, see [llms.txt](https://worlddao.gitbook.io/worlddao-white-paper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://worlddao.gitbook.io/worlddao-white-paper/technical-implementation/footnotes.md).

# Footnotes

1. Also evaluated were private information retrieval (PIR) protocols, but even with state-of-the-art protocols like OnionPIR and further optimizations, the services would need 10 seconds of multi-core compute per request. Multi-party computation (MPC)-based PIRs would perform much better, but they offer no anonymization advantage over using an MPC-based anonymization network. 
2. Note there’s a trust assumption on obtaining the inclusion proof from an indexing service as the user needs to provide their identity commitment to obtain an inclusion proof. Further decentralization of the indexing service is being explored. 
3. It is sufficient to check uniqueness on a per-context basis, but the nullifiers should be globally unique values. 
4. In this context, *credential* is used as a generic term to refer to a set of data about a subject, and in this case attested by a third-party (called issuer). 
5. ZKML would allow the iris code to be recalculated in the event of a model upgrade, without users needing to go back to an Orb. 
6. In this, *issuer* is the party who attests to a set of data about a subject. For example, Tools for Humanity is the issuer of the Orb credential. 
7. This is in addition to the decentralization introduced by the distribution of Orb manufacturing and operations across different entities. 


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