That&#x27;s true; what cropped up after Convergence was TACK: <a href="http:&#x2F;&#x2F;tack.io&#x2F;index.html" rel="nofollow">http:&#x2F;&#x2F;tack.io&#x2F;index.html</a><p>It too has seen not a lot of traction. However, Google has implemented a competing stack into Chrome (and Firefox supports it) in HPKP (HTTP Public Key Pinning) with sites having the ability to pin their cert, and these browsers will trust that bond all day.