Satchel v0.1.0-alpha - regtest tech demo

Meet Satchel 🎒

Satchel is a trustless, non-custodial way to swap BTCX ⇄ BTC directly with another person — no exchange, no custody, no accounts, no fees. You post or browse offers on a shared noticeboard (or over Nostr relays), pick one, and the swap settles atomically on-chain: either both legs complete, or neither does.

What's in the box

• 🤝 Atomic swaps — HTLC (v1) and Taproot/MuSig2 adaptor (v2, which looks like a plain Taproot spend on-chain).
• 📌 Corkboard — a noticeboard, not an exchange: humans pick offers, no order matching, no execution, no fees.
• 🛰️ Nostr transport — offers travel over relays, no central server required.
• 🤫 Private offers — trade off-market with a friend via a pasteable, signed "slip" — nothing ever hits the public board.
• 🖥️ Desktop app and full CLI — the Satchel GUI rides on the pactd daemon; everything is scriptable through pact-cli.
• 🔑 Non-custodial — your keys, your nodes; proceeds sweep straight to your own wallet.

Try the regtest demo (attached below)

A one-command, self-contained demo — local regtest chains + a Nostr relay + two bots posting a live two-sided book. You trade as "Alice." Close the window and the whole stack tears itself down.

• 🪟 Windows: satchel-demo-x86_64-windows.zip — unzip, run Run-Demo.cmd.
• 🐧 Linux: satchel-demo-x86_64-linux-gnu.tar.gz — extract, ./run-demo.sh (needs libwebkit2gtk-4.1-0).

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⚠️ Experimental alpha — regtest only, not real funds. The v2 (Taproot) swap path is unaudited. This is a tech demo of the workflow, not a production release.