RFC 6920: Naming Things with Hashes

Interesting, I'd not known of this RFC before.

Another example of a content-addressed data store could be OCI registries (more commonly known as container image registries). Using them to store arbitrary artefacts is quite well supported now: https://oras.land/

here is an implementation in Go for fun:

    package rfc6920
    
    import (
       "crypto/sha256"
       "encoding/base64"
    )
    
    func rfc6920(s string) string {
       sum := sha256.Sum256([]byte(s))
       return base64.RawURLEncoding.EncodeToString(sum[:])
    }