You're defining "secure" as meaning "confidential," which is understandable though not entirely accurate. At its simplest and most abstract, information security also includes integrity and availability. I'm oversimplifying it, but hopefully you see where I'm getting at.
integrity i.e. ensuring that data received, changed, and removed is exactly as expected and accurate per the requirements for the data over the lifecycle of the data.
availability i.e. ensuring that the data is accessible/usable for the use cases intended.
That said, confidentiality could also be relevant for a system of truth such as this one. There may well be certain data elements that one might want to restrict e.g. only to people who share genetic history with an ancestor. (as an example)
integrity i.e. ensuring that data received, changed, and removed is exactly as expected and accurate per the requirements for the data over the lifecycle of the data.
availability i.e. ensuring that the data is accessible/usable for the use cases intended.
That said, confidentiality could also be relevant for a system of truth such as this one. There may well be certain data elements that one might want to restrict e.g. only to people who share genetic history with an ancestor. (as an example)
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https://en.wikipedia.org/wiki/Information_security#Key_conce...
if it helps.
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edit2: security (confidentiality) in permanent.org elaborated: https://www.permanent.org/digital-archives/services/privacy-...