> 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/biometric-uniqueness-service.md).

# Biometric Uniqueness Service

While the iris code is computed locally on the Orb, the biometric uniqueness service i.e. the determination of uniqueness based on the iris code is performed on a server since the iris code needs to be compared against all other iris codes of humans who have verified before. This process is getting increasingly computationally intensive over time. Today, the biometric uniqueness service is run by Tools for Humanity. However, this should not be the case forever and there are several ideas regarding the [decentralization of this service](https://whitepaper.worldcoin.org/decentralization-and-open-sourcing#uniqueness-service).


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