Advancing multisig for the whole world
We build and maintain open source multisig tools for the global bitcoin community, contributing to the ecosystem that makes bitcoin possible.
Why open source is critical:
Building on bitcoin.
By providing best-in-class, secure, open source signing tools, we're not just investing in our own future, but also in the bitcoin network.
Working in public
Our open source development is a reflection of our engineering culture. We believe long-lived systems are strengthened by scrutiny, and we build software meant to stand the test of time.
Leading the way on bitcoin multisig
Investing in open source helps us discover cutting-edge solutions that keep us at the forefront of bitcoin self-custody and multisig, and preventing single points of failure (including ourselves).
Planning with 2140 in mind
Custody software should outlast companies, products, and market cycles. Open source is how systems ensure that longevity.
Caravan
Caravan is Unchained’s stateless, open source multisig wallet tool. Caravan was designed as a recovery tool for vaults and loans; Unchained clients can use the tool to retain full access to their bitcoin in the case that Unchained services are down or no longer exist.
Caravan bitcoin
Caravan-Bitcoin is an open Javascript library that contains useful functions for key management, validation, and especially multisig address construction and transaction authoring. It relies on the popular and well-tested bitcoinjs-lib library but layers in additional functionality to help developers quickly get up and running with multisig.
Caravan wallets
Caravan wallets is a Javascript library that contains Trezor, Ledger, and Hermit interactions through the browser. It can be used to more easily integrate bitcoin hardware wallet devices with a multisignature wallet application.
Hermit
Hermit is a command-line, sharded, air-gapped wallet designed to help groups of people safely manage and use bitcoin private keys through leveraging the emerging SLIP-0039 standard. It is designed to run in a stripped-down Linux environment on custom hardware with WiFi, bluetooth, USB, and all other forms of wired & wireless communication removed.
Bitcoin PSBTv2 explorer
Created by one of our engineers as a hobby project, bip370.org is a tool for parsing partially signed bitcoin transactions (PSBTs). It was inspired by bip174.org, with the intention of adding compatibility for newer versions of PSBTs. Notable features include converting between PSBT versions, converting the serialization encoding, and flags for the state of the operator roles saga.