Verifiable Credentials work by Resonate Co-op

https://credentials.resonate.is/

Resonate’s Community Credentials project helps communities to award simple badge-like credentials that can be proven and recognised across organisations.

The technical overview has details about a reference implementation as some NodeJS apps and a Discourse plugin.

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Verifiable Credentials are a W3C Standard which are designed to link into Decentralized Identifiers (DIDs).