OpenSats Grant Fuels Bitcoin-Safe Safe Multi-Sig Wallet Fire Hardware Focus

Bitcoin Magazine

OpenSats Grant Fuels Bitcoin-Safe Safe Multi-Sig Wallet Fire Hardware Focus

Bitcoin-Safe, an open source Bitcoin savings wallet, is now available for families, individuals and businesses looking for safe, long-term Bitcoin storage. It focuses on multi-sig security and distinguishes itself from other desktop wallets such as Electrum and Sparrow, as it requires a hardware wallet for mainnet operations. Supported by the one-year OpenSats Grant awarded in March 2025, Bitcoin-Safe is the latest version 1.5.0 released on September 1, 2025, combining robust security with a redesigned user interface.

Development and OpenSat Support

Developed by Andreas Griffin for over two and a half years, Bitcoin-Safe aims to simplify multi-sig setups and reduce reliance on Electrum servers. “I started with this wallet two and a half years ago, and I had two goals to make multisig easier and not have to resort to Electrum servers,” Griffin told Bitcoin Magazine. OpenSats Grant, which will be held from March 2025 to March 2026, supports these efforts. The open source code for wallets built into the Bitcoin Dev Kit (BDK) is auditable on GitHub, and installable clients are available for free at Bitcoin-safe.org/download.

Multisig, hardware wallet security, coin control

Bitcoin-Safe enforces hardware wallets for the mainnet and prohibits software seeds from mitigating security risks. “There’s no way around hardware wallets to save money,” Griffin said, highlighting compatibility with major hardware devices via QR, USB or SD cards. This allows Bitcoin Safe to allow software seeds, prioritize security for significant savings, and minimize “footguns.” This is a feature that users can easily hurt.

The Wallet Multisig Setup Wizard generates PDFs with wallet descriptors, such as send and receive tests for validation. “After this wizard is finished, you can make sure it’s set up correctly,” Griffin said. This ensures reliable configuration and allows for multisig access without compromising security.

Using the NOSTR protocol, Bitcoin-Safe synchronizes transactions and addresses the entire end-to-end encrypted device label. “We create protocols on top of Nostr to link these computers and synchronize labels seamlessly,” Griffin said. Multisig participants can share partially signed Bitcoin Transactions (PSBTs) with a single click, and the relay stores encrypted messages for asynchronous access.

The Coin category separates funds such as KYC exchange withdrawals and private coins to prevent unintended transaction connections. “You should not link it by mistake as you need to select the source of the fund,” Griffin supported the privacy of users.

User Interface and Experience

Version 1.5.0 introduces a new interface developed with @Design-R. “The designers who participated in the project are really very helpful,” Griffin said. Features include a sidebar for managing multiple wallets, an updated transaction view for sending and signing PSBTs, and a Mempool visualization showing block and fee data.

The wallet will add keyboard shortcuts, tooltips and clear error messages. Bug fixes improve functionality and ensure accessibility for beginners and advanced users.

Bitcoin-Safe supports real-time conversion of 123 Fiat currencies integrated into the interface. It also converts Bitcoin to gold or silver values ​​in ounces and grams. Real-time Mempool alerts notify users of transaction propagation. “This is an opt-in feature for existing users and opt-out of new installations,” Griffin said, noting in a customizable network setting.

Users can unlock multiple wallets with a single encryption password. “If multiple wallets share the same encryption password, users must enter it only once,” explained Griffin. Nostr’s Chat & Sync feature enables remote PSBT adjustments for multi-sig participants.

Community and Accessibility

Bitcoin-Safe supports languages ​​such as English, Chinese, and Spanish, as well as translation via Weblate. Users can test with TBTC, report bugs, or donate via Lightning or Onchain. Engagement is done through chorus.community and x accounts (@bitcoinsafe, @bitcoinsafecn) and documentation is available at bitcoin-safe.org.

Future Development: Compact Block Filter

Bitcoin-Safe plans to replace the Electrum server in 2025 with integrated compact block filters. “My plan is to replace (Electrum Servers) with a compact block filter and retrieve blockchain data directly from the Bitcoin core node,” Griffin said, aiming to enhance privacy and server independence.

This post OpenSats Grant Fuels Hardware Focus with the launch of Bitcoin-Safe’s safe multi-sig wallet was first published in Bitcoin Magazine and written by Juan Galt.

Source: https://bitcoinmagazine.com/business/opensats-grant-fuels-bitcoin-safes-secure-multisig-wallet-launch-with-hardware-focus