Oleg Fomenko publishes offline threshold Schnorr wallet for Bitcoin
The open-source frost-wallet packs ChillDKG key generation and FROST-style signing into a single HTML file that never touches the internet
Developer Oleg Fomenko has released frost-wallet, an open-source threshold Schnorr wallet for Bitcoin that runs entirely offline.
The whole thing lives inside a single, self-contained HTML file. No server, no network connection, no cloud account quietly phoning home.
What frost-wallet actually does
Frost-wallet supports what cryptographers call t-of-n setups. A group of n participants each holds a share, and any t of them can cooperate to sign a transaction.
No single person ever holds the complete private key. Lose one share, or have one stolen, and the funds remain safe as long as the threshold isn’t met.
Fomenko, who publishes on GitHub as olegfomenko, built the wallet in Rust. The Rust code is compiled to WebAssembly and paired with JavaScript, which is how the entire application fits into one browser-readable file.
Participants and a coordinator pass messages back and forth through QR codes, plain text, or files. Every step of key creation and signing can happen on air-gapped machines, which means the devices are physically cut off from any network.
The cryptography under the hood
The first building block is ChillDKG, a draft Bitcoin Improvement Proposal developed by Blockstream Research. DKG stands for distributed key generation, a method for creating key shares so that the full key is never assembled in one place, not even at the start.
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The ChillDKG draft first emerged in 2024. Fomenko’s implementation is tied to an associated Rust library, the chilldkg-rs crate, which received updates alongside the wallet repository in October 2026.
The second building block is a FROST3-style signing procedure, drawn from the draft BIPs covering FROST signing. FROST is a protocol for threshold Schnorr signatures, letting multiple parties jointly produce a single signature.
The final product is a BIP340 signature. BIP340 is the Schnorr signature standard that Taproot, Bitcoin’s 2021 upgrade, relies on.
The wallet handles PSBTs, or Partially Signed Bitcoin Transactions, which are the industry’s standard format for passing an unfinished transaction between signers. Frost-wallet’s PSBT support is built specifically for key-path Taproot spends.
It also includes backup and recovery through host secret keys. For anyone wary of downloading a mystery HTML file, the project supports reproducible builds through GitHub Actions.
Why the audit question looms large
Neither frost-wallet nor the underlying ChillDKG library has gone through a formal security audit.
The underlying specifications are also still drafts. Both ChillDKG and the FROST signing proposals remain proposed BIPs, which means their details could still change.
The release has drawn interest within the Bitcoin community. It has not yet prompted significant expert analysis or published reviews of its security.
What this means for Bitcoin custody
The immediate audience is developers and technically sophisticated users who want to experiment with ChillDKG and FROST before the drafts are finalized.