# A worked example: KYC eligibility without building a PII warehouse

> You already have the customer. This walkthrough shows how to answer a new eligibility question without building another database full of passports.

- URL: https://www.affix-io.com/blog/kyc-eligibility-without-pii-warehouse/
- Published: 2026-08-28
- Section: Worked example
- Keywords: KYC eligibility, PII warehouse alternative, prove on host KYC, data minimisation KYC

## Summary
Step-by-step worked example showing how a lender re-validates KYC eligibility on existing records without copying customer files into a central PII warehouse.

## FAQ
Q: Do we need a data lake of identity documents?
A: Only if your policy says so. Many eligibility questions can be answered from fields you already validated at onboarding.

Q: What triggers a re-check in this example?
A: A new product application: the lender must confirm the customer still meets affordability and sanctions policy before increasing exposure.

Q: What gets stored after the check?
A: A signed outcome, timestamp, policy version, and method. Not a fresh copy of the passport image.

Q: Where does AffixIO sit in the stack?
A: On the host that can read the core record. It returns the yes/no and signature to your decision service.

## Internal links
- https://www.affix-io.com/finance-gate/
- https://www.affix-io.com/product/
- https://www.affix-io.com/developers/

AffixIO blog. Human-authored. United Kingdom.