Caravan

Caravan is a coordinator for multisig Bitcoin wallets. It connects a source of consensus — your own Bitcoin node — to your keys, and uses them to create multisig addresses and build transactions that spend from them, aiming to make multisig custody easier to reason about through transparency and open standards.

Its defining design choice is being stateless: Caravan stores no data itself. That removes a database to be breached or corrupted, but it makes the tradeoff explicit. You are responsible for safekeeping your wallet's details, including its addresses, redeem scripts, and BIP32 derivation paths. Keys alone may not be enough to recover funds without them.

In practice it is used to establish a quorum such as two-of-three, combining hardware wallets and keys stored in different places, and then to construct and sign spends when the time comes. It runs as a pure HTML and JavaScript application in the browser, with no backend service of its own.

Pointing it at your MyNode means address balances and transaction broadcasts go through your own node rather than a public API, so the addresses in your multisig wallet are not disclosed to a third party as a side effect of checking on them.