In Peergos we are using exactly the cryptree data structure from wuala for our encrypted filesystem on top of ipfs. <a href="https:&#x2F;&#x2F;github.com&#x2F;ianopolous&#x2F;Peergos" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;ianopolous&#x2F;Peergos</a>