What is Nostr?
/ Andreas Griffin
npub1q67…up0e
2025-03-17 15:46:23

Bitcoin Safe

Bitcoin Safe - A bitcoin savings wallet for the entire family

Designed for both beginners and power users, Bitcoin Safe combines security with an intuitive user experience. In this article, we dive deep into its features, unique benefits, and the powerful tools that make managing your Bitcoin wallet simple and secure.

Built for Learners

✔️ Step-by-step wallet setup wizard + PDF backup sheets 📄 🧪 Test transactions to ensure all hardware signers are ready 🔑 🛡️ Secure: Hardware signers only – no hot wallet risks 🚫🔥 🌍 Multi-language support: 🇺🇸 🇨🇳 🇪🇸 🇯🇵 🇷🇺 🇵🇹 🇮🇳 🇮🇹 🇫🇷 🇩🇪 🇲🇲 🇰🇷 📁 Address categories for easy organization ☁️ Label and category synchronization, and cloud backup (optional) 💰 Automatic UTXO merging to save on fees ⚡ Fast syncing with Electrum servers, Compact Block Filters coming soon

Built for Power Users

🔐 Supports Coldcard, Bitbox02, Jade, Trezor, Passport, Keystone & many more 🏦 💬 Multi-party multisig chat & PSBT sharing (optional) 📊 Transaction flow diagrams to trace coin movements 🔍 Instant cross-wallet wallet search ⚙️ Set your own electrum server, mempool instance, and nostr relay

Step-by-Step Wallet Setup

Whether you’re setting up a single-signature or multi-signature wallet, the setup wizard guides you every step of the way:

Clear instructions paired with hardware signer screen-shots, like the steps for a Coldcard

  • Multisig Wizard: The wizard ensures you do all necessary steps for a Multisig wallet in the right order. Afterwards your Multisig is ready to use and all signers are tested. Check out https://bitcoin-safe.org/en/features/setup-multisignature-wallet/

  • PDF Backup: The wizard will also generates 3 PDF backup sheets for a 2-of-3 multisig wallet, so ensure you always have your wallet descriptor together with the seed. PDF Backup GIF

  • Hardware Signer Support: With full support for major hardware signers your keys remain securely offline.

Transaction Visualization

Visualize and navigate your transaction history:

  • Graphical Explorer: An interactive transaction diagram lets you click on inputs and outputs to follow the money flow intuitively. Transaction Explorer GIF

  • Coin Categories: Organize your addresses into distinct coin categories (e.g., “KYC”, “Work”, “Friends”) so Bitcoin Safe automatically selects the correct inputs when creating PSBTs.

It prevents you accidentally linking coin categories when creating a transaction, and warns you if mistakes happened in the past. Coin Categories GIF

Powerful Wallet Management Tools

  • Flexible Fee Selection: Choose fees with one click using an intuitive mempool block preview.
  • UTXO Management: Automatically (optional) merge UTXOs when fees are low.
  • CSV Table Export: Right click, Drag&Drop, or CTRL+C for immediate CSV export for easy processing in Excel.
  • PDF Balance Statement: Export the address balances for easy record keeping on paper.

Advanced Features for the Power-User

Sync & Chat is off by default (for the paranoid user), but can be enabled with just one click.

Label Synchronization and Backup

  • Seamless Sync: Using encrypted nostr messages, Bitcoin Safe synchronizes your coin categories and labels across multiple devices. Label Sync GIF
  • Easy Backup: A short backup key is all you need to safeguard your coin categories and labels, ensuring your organization remains intact.

Collaborative Multi-party Multisig

  • Group Chat Integration: After creating your multisig wallet, Bitcoin Safe offers an encrypted nostr group chat for secure collaboration and one-click PSBT sharing. Collaborative Chat GIF
    • User Authentication: Each participant must authenticate every other user with a simple click, ensuring secure communication.

Watch and Learn: Get Started with Bitcoin Safe

If you’re new to Bitcoin Safe, a short video guide can make all the difference. Learn how to set up your Bitcoin Safe wallet in this detailed walk through:

https://youtu.be/m0g6ytYTy0w

Or see how to verify an address on your hardware singer:

https://youtu.be/h5FkOYj9OT8

Building up a knowledge base: https://bitcoin-safe.org/en/knowledge/

Whats next?

  • Compact Block Filters!!! They make electrum servers obsolete.
    • Why? Compact Block Filters increase the network privacy dramatically, since you’re not asking an electrum server to give you your transactions
    • Trade-off: They are a little slower than electrum servers. For a savings wallet like Bitcoin Safe this should be OK.
    • How do they work? Simply speaking: They ask normal bitcoin core nodes for a short summary of each block. And if the summary shows a transaction belonging to the wallet, the entire block is then downloaded from the bitcoin core node. The bitcoin core node does not learn however which of the many transactions in the block you were interested in. Read more here and of course in the bip.
    • When: 2 weeks 😅. Lots of things need to be done until Bitcoin Safe can use the bdk CBF/kyoto client from rustaceanrob, so keep an eye out for updates and please give feedback when you use Bitcoin Safe.

Stay updated on nostr or on GitHub.

Thank you

A huge thanks goes to OpenSats (npub10pe…n34f) for supporting this project with a grant and Sats n Facts (npub1yrn…k5cx) for the Hackathon prize.

This wallet is only possible because it is building upon other peoples open source work. Most notably

And of course, secure storage of bitcoin is only possible, because of the hardware signer manufacturers. Thanks to NVK (npub1az9…m8y8) Coldcard , Coldcard Q , BitBox (npub1tg7…cxmt) Bitbox02 , Blockstream (npub1jg5…6n8n) Blockstream Jade , Trezor Safe, Foundation Passport, Keystone, Ledger, Specter Shield, and many more.

I also want to thank people who gave feedback and helped spread the knowledge of Bitcoin Safe (please forgive me if I forgot to mention you)

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