Multisig & Collaborative Custody

Multisig & Collaborative Custody

Bitcoin Keeper is an open-source mobile wallet built around multisig self-custody, developed by BitHyve. It lets users assemble vaults from multiple hardware and software signers while retaining full control of their keys.

Software Wallets

Bitcoin-Safe is free and open-source desktop software for managing bitcoin cold storage wallets, built on the Bitcoin Development Kit. It requires a hardware signer and provides a modern interface for single-signature and multisig cold storage across Windows, macOS and Linux.

Hardware Wallets

Bitkey is a bitcoin-only 2-of-3 multisig wallet combining a hardware device, a mobile app key and a server key, so there is no seed phrase to write down. The design includes built-in inheritance and recovery flows while the owner keeps control of spending.

Software Wallets

BlueWallet is an open-source mobile and desktop bitcoin wallet that includes a Multisig Vault feature alongside standard and watch-only wallets. Keys never leave the user's device, so the vault is fully self-custodial.

Multisig & Collaborative Custody

Casa provides multi-key self-custody for bitcoin using keys spread across several devices and locations, so no single device failure loses access. Plans add white-glove security guidance, inheritance planning and recovery support while the customer keeps control of their own keys.

Software Wallets

Electrum is a long-running open-source bitcoin wallet that supports multisig wallets, splitting the permission to spend coins between several wallets. It also supports cold storage with watch-only wallets, hardware devices and third-party multisig service plugins.

Hardware Wallets

Krux is open-source firmware that turns off-the-shelf Kendryte K210 devices into airgapped bitcoin transaction signers, commonly used as one of the signers in a multisig setup. It also provides tooling for creating, encrypting and recovering mnemonic backups.

Multisig & Collaborative Custody

Liana, built by Wizardsardine, is a bitcoin wallet whose spending policies include timelocked recovery paths so users are never locked out without handing keys to a third party. A free open-source community edition runs against your own node, while Liana Business adds hosted infrastructure, policy design and PSBT signing coordination for organisations.

Multisig & Collaborative Custody

Nunchuk is a multisig wallet and bitcoin inheritance platform that operates without KYC and is built on open standards so wallets can be recovered independently of the company. Its assisted multisig plans add on-chain or off-chain timelock inheritance protocols, key health checks and guided claims for heirs.

Software Wallets

Sparrow is a desktop bitcoin wallet with full support for single-signature and multisig wallets across common script types. It connects to your own node or a public server and works with hardware signing devices, keeping all keys under the user's control.

Software Wallets

Specter Desktop is an open-source interface for Bitcoin Core focused on multisignature setups with airgapped signing devices. It supports major hardware wallets including SeedSigner, Specter DIY, Blockstream Jade and Coldcard.

Multisig & Collaborative Custody

Theya is a bitcoin custody platform offering multi-key vaults for individuals, families, businesses, funds and advisors. Vault configurations such as three-key setups let the account holder retain keys while managing members, policies and balances from one dashboard.

Multisig & Collaborative Custody

AnchorWatch pairs its Trident Vault bitcoin custody technology with optional Lloyd's of London insurance. Customers can choose a Flagship model where they hold their own private keys alongside AnchorWatch, or a multi-institution model that distributes keys across three institutions.

Multisig & Collaborative Custody

Unchained offers collaborative custody bitcoin vaults in which the client holds their own keys alongside Unchained as one cosigner. The company layers financial services on top of that vault structure, including trust vaults, a bitcoin IRA, trading, loans and inheritance planning.

Education & Resources

The 10x Security Bitcoin Guide walks a non-coding but tech-savvy audience through setting up bitcoin storage with no single point of failure using multisig. Its premise is that a fault-tolerant setup lets you survive one or more catastrophic mistakes that would be fatal in a single-key system.

Multisig & Collaborative Custody

Caravan is a free and open-source bitcoin multisig coordinator, originally released by Unchained and now maintained as the Caravan FOSS monorepo. It runs in the browser and lets users build and spend from multisig wallets without trusting a hosted service with their keys.

Multisig & Collaborative Custody

CKBunker is Coinkite's open-source software for running a Coldcard in HSM mode so transactions can be authorised over Tor according to a preset policy. It is aimed at teams and businesses that need policy-controlled signing while retaining their own keys.

Multisig & Collaborative Custody

Inheriti is a digital inheritance and secret-data protection service that splits sensitive information such as seed phrases into distributed shares. Plans cover personal digital inheritance, data backups, access management and business continuity without the provider holding a usable copy of the secret.

Multisig & Collaborative Custody

Onramp is built on Multi-Institution Custody, where bitcoin is secured by three independent institutions in a multisig arrangement rather than a single custodian. It bundles that custody model with brokerage, inheritance, lending and cash management in one account.

Multisig & Collaborative Custody

Vault12 is a mobile app for backing up and inheriting crypto wallet seed phrases using a network of trusted Guardians rather than a custodian. The company states plainly that it is not a custodian and never holds, transfers or accesses user funds.

Multisig & Collaborative Custody

Swan Vault is a 2-of-3 multisig cold storage product from Swan Bitcoin designed to make self-custody approachable for non-technical holders. Swan provides an interface and expert support while the customer keeps sole spending authority over their bitcoin.