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name: bitcoin-infrastructure-caravan description: | Caravan: open-source web-based multisig coordinator (no install). Read-only by default; HW wallet support via HWI bridge. USE WHEN: setting up multisig without installing software, educational multisig flows. allowed-tools: Read, Grep, Glob

Caravan

Web-based multisig coordinator by Unchained Capital. Browser-only, no install. Open-source.

URL: caravanmultisig.com (or self-hosted).

Features

• Multi-vendor multisig: Trezor, Ledger, Coldcard, etc.
• PSBT workflow.
• Read-only by default — keys never leave devices.
• Wallet creation via descriptor + xpubs.
• Test mode for learning before mainnet.

Setup flow

1. Create wallet config: pick threshold (2-of-3 etc.) + key sources.
2. For each key:
   • Connect HW wallet via HWI bridge (HTTP).
   • Enter xpub at standard derivation.
3. Save wallet config (JSON) — needed for recovery.
4. Generate addresses; verify on each HW wallet.
5. Sign PSBTs by passing through each device.

Compared

Aspect	Caravan	Sparrow	Specter
Install	None (web)	Yes	Yes
Bitcoin Core	optional	recommended	recommended
Multi-sig only	yes	no	no
Lightning	no	partial	yes
Maturity	mature	mature	mature

Use cases

• Multisig newcomers wanting browser-based flow.
• Educational: walk through multisig setup.
• Air-gapped quick coordination between users.

Common issues

• HWI bridge runs locally; if not running, no HW connection.
• Pure web means cleared cache loses wallet config — always save the JSON config file.
• Public-host caveat: even though browser-only, network requests may leak metadata; for high-value, self-host.

See also

• specter-desktop/SKILL.md
• sparrow/SKILL.md
• ../hardware/hwi/SKILL.md
• ../hardware/multi-vendor-multisig/SKILL.md