operator applications, the syntax also includes list iteration,
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In real systems we do need to be a bit careful to ensure that the key K is chosen honestly and at random, to avoid a user duplicating another user’s key or doing something tricky. Often real-world issuance protocols will have K chosen jointly by the Issuer and User, but this is a bit too technically deep for a blog post.
Nature, Published online: 04 March 2026; doi:10.1038/s41586-026-10182-7