askhuman.app
The server stores ciphertext for seven days. The browser gets the key from the URL fragment and renders the decrypted single-file HTML in a sandbox.
The curl response gives the agent the OpenSSL recipe, the upload endpoint, and the exact rule that the final URL must end with #k=...
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Browser bookmarklet
askhuman snapshot Drag it to your bookmarks bar. Click it on a page to encrypt a DOM snapshot and open the share link in askhuman.app.