Paper
What the five implementations actually proved
The paper now says explicitly that its interoperability result describes a revision that no longer exists. Deleting the claim would have been wrong; leaving it unqualified would have been worse.
First draft of the HTMLTrust paper: Toward Decentralized Trust and Verifiable Content on the Web
The April 2026 announcement of the founding HTMLTrust draft paper, kept online as a record. Superseded: this describes an early draft, and the paper was never published as this post claimed.