Major digital rights group the Electronic Frontier Foundation (EFF) has said a proposed law to put medical records on the blockchain would be a major privacy breach.
Proposed in the California legislature earlier this year, the bill, A.B. 2004, would create verifiable health records on the blockchain that citizens show on entry into public buildings or public transportation to check whether they have or have had the coronavirus.
Source:
https://www.coindesk.com/privacy-group-conceived-california-bill-health-records-blockchain