Thread by @rklau

Less than 2 months from first line of code to 1M Digital Vaccine Records delivered to California residents. So proud of my team.

When I joined the State, a lot of folks asked why state government can't move as quickly as the private sector. Guess what? It can, and does! 👇🏻

https://twitter.com/CADeptTech/status/1415000124518977541

This blog post provides a bit more background on what the QR code is, and how it works. I'm going to pull out a few specifics in this thread, and add a few other details I think are worth calling attention to:

1/ The QR code in the Digital Vaccine Record is a SMART Health Card, an open-source framework developed by @SMARTHealthIT and embraced by VCI.org; more details at smarthealth.cards.

@SMARTHealthIT 2/ @vishnuravi did a great post on Medium about the technology involved with SMART Health Cards -- if you're interested in what's going on here, I highly recommend it: vishnuravi.medium.com/how-do-verifia…

@SMARTHealthIT @vishnuravi 3/ if you point your iPhone at the QR code, you'll see "no usable data" on your camera. (Android users will see a long string of text, starting w/a "shc:/" prefix.) This isn't a bug: the long string of text is what’s known as a "FHIR bundle".

@SMARTHealthIT @vishnuravi 4/ FHIR stands for Fast Health Interoperability Resources, and is an emerging collection of standards designed to improve the interoperability of healthcare data. More information is at fhir.org.

5/ The bundle is then cryptographically signed by the State of California; any SHC-compatible reader can validate that signature by using the state’s public key, published on the My Vaccine Record site at myvaccinerecord.cdph.ca.gov/creds/.well-kn….

6/ When the QR code is scanned by a SHC-compatible reader, the reader can verify the signature, which confirms the authenticity of underlying information. (If the FHIR bundle had been modified, the signature verification would fail, resulting in an unsuccessful scan.)

7/ Speaking of SHC-compatible readers, two big developments on that front in the last week:

- @commons_prjct launched a SMART Health Card Trusted Verifier app, which scans the QR code & validates that cryptographic signature: thecommonsproject.org/smart-health-c…

@commons_prjct - yesterday, the State of Hawaii, along with @commons_prjct, announced that your SMART Health Card vaccination record can serve as proof of vaccination, avoiding a 10 day quarantine when you visit Hawaii: thecommonsproject.org/newsroom/press…

8/ A final note on the DVR system design: we match contact info entered on the portal w/info already on file with the California Immunization Registry. If your contact information is missing from the immunization registry, we cannot match your info, and can't send a link. ...

... since launch, we've worked closely with a number of vaccination providers, and even more contact information has been added to the underlying immunization registry for several million California residents.

If you can’t retrieve your record, contact your provider and ask them to send updated contact information to the state’s immunization registry. You can also use the California Department of Public Health’s Virtual Assistant to get your record updated. chat.myturn.ca.gov/?id=17

More to come! Have a few fun enhancements coming soon - in the meantime, keep your feedback coming. /end