Bold Bitcoin WalletSeedless Bitcoin Signing Over Nostr

What Threshold Signatures Replace

A traditional Bitcoin wallet relies on a seed phrase, a sequence of words that can regenerate every private key the wallet controls. Whoever holds those words holds the money, and losing them usually means losing access for good. Threshold signature schemes take a different approach. The private key is split into shares, and each share lives on a separate device. No single device ever contains the complete key, so there is no single phrase to steal or misplace.

A signature is produced only when enough shares cooperate. In a two-of-three setup, any two devices can approve a transaction, while one device alone cannot. This is why the approach is often described with the term MPC, short for multi-party computation, which allows the signing to happen without reconstructing the full key in one place.

The trade-off is operational rather than technical. You need to keep track of which devices hold shares, make sure they stay reachable, and understand that the wallet is only as available as the devices you have paired. Seed phrases are simpler to explain to a friend, but threshold signing spreads risk across hardware you already own, which is the core idea behind the design.

Who Bold Bitcoin Wallet Is For

The most natural user is someone who already runs two or more personal machines and wants them to act as a shared safeguard for bitcoin. A household might keep one laptop at home and a second in a separate location, so that a single compromised or lost device cannot move funds on its own. Small teams that want two people to approve outgoing payments can apply the same logic.

Another group is people who have grown uneasy with paper backups. If you have ever wondered where a notebook of seed words is stored, or worried about fire, flood or a careless cleaning crew, a seedless model removes that particular chore. The trade-off is that you must be willing to manage a multi-device setup and to pair devices correctly the first time.

Users who only ever want a single device and a simple recovery phrase may find the workflow unnecessary. Those who value transparency should note that the code is public, which lets technically inclined users inspect it before trusting it with money. Everyone else benefits most from treating the wallet as one part of a careful routine rather than a shortcut to security.

How Nostr Relays Fit Into Device Pairing

Nostr is an open protocol in which clients send signed messages through relays, which are independent servers that store and forward those messages. Anyone can run a relay, and a client can use several at once. Because identities in Nostr are based on cryptographic keys rather than accounts held by a company, two devices can find each other without a central service brokering the connection.

In Bold Bitcoin Wallet, relays serve as the meeting point for pairing. One device publishes an encrypted message, and the other picks it up from the same relay, which allows the exchange to happen even when the devices are on different networks. Because the content is encrypted with NIP-44, the relay carries ciphertext rather than readable instructions.

It helps to understand what relays can and cannot see. They can observe timing, the fact that two clients are communicating, and the approximate size of messages, even if they cannot read the payload. For most users that trade-off is acceptable, but it is a reason to keep device pairing on a local network when privacy from metadata is a priority.

Supported coins

The project's documentation names Bitcoin (BTC) as the asset the wallet handles, with Nostr serving as the communication layer that links the paired devices. Transactions can be exchanged in the PSBT format, which keeps the wallet compatible with other Bitcoin software.