Stegstr
Reference
Everything that is true about Stegstr today, in one place. The repository is the source of truth; these pages are the readable version.
How it works ยท Lightning and ecash
The three hiding methods, what each survives, and the encryption around the payload.
Command line
The Node CLI that needs no install, and the Rust CLI with JSON output, exit codes and an MCP server.
For agents
Copy-paste commands, the MCP configuration, the in-app scripting API, and the machine-readable files.
Nostr
Identities, what Network on means, relays and the default relay, direct messages.
FAQ
Who can read an image, what formats work, what does not survive, how much fits.
Privacy
What leaves your device and when, stated plainly.
Contributing
Issues and pull requests go to github.com/brunkstr/Stegstr. Adding a hiding method is documented in docs/codecs.md: implement the codec contract, register it, and meet the verification bar (blind survival on three covers, cross-decode with the CLI and web build). The app came out of the 2026 Stegstr contest; the leaderboard records every entry and what was measured.