A research benchmark known as the Yukon benchmark reportedly estimates that making a Bitcoin transaction quantum-safe could cost 82% less than earlier projections suggested. The figure has not been independently verified, but it lands at a moment when new on-chain data shows a growing share of Bitcoin's supply sitting in a position that a sufficiently powerful quantum computer could theoretically exploit.

According to a single source that could not be independently verified at publication time, the Yukon research benchmark estimated an 82% reduction in the cost of a quantum-safe Bitcoin transaction relative to a prior baseline. The cryptographic scheme, transaction model, and fee assumptions behind that number have not been confirmed in any publicly accessible research paper or official release, and the 82% figure should be treated as an unconfirmed report until its methodology is auditable.

Why Quantum-Safe Transactions Have a Cost Problem

Bitcoin relies on a signature scheme called ECDSA (Elliptic Curve Digital Signature Algorithm) to prove ownership when funds are spent. As Bitcoin Optech explains, ECDSA public keys are vulnerable to Shor's algorithm on a sufficiently capable quantum computer, meaning a future quantum machine could derive private key from a public key and steal funds.

Moving to a quantum-resistant alternative is not free. CoinDesk's coverage of a Europol warning reported that new post-quantum signature schemes can be 10 to 120 times larger than Bitcoin's current ECDSA signatures. Larger signatures translate into larger transactions, and larger transactions mean higher fees on a network where block space is limited.

That size difference directly shapes what it would cost to migrate Bitcoin transactions to a quantum-resistant format. A benchmark that tests a specific post-quantum scheme against a specific transaction template can produce a cost estimate, but the result is only as reliable as its assumptions about signature size, block weight, and network fee rates at the time of migration.

In August 2024, NIST finalized three post-quantum cryptography standards: FIPS 203 for general encryption, along with FIPS 204 (ML-DSA) and FIPS 205 (SLH-DSA) for digital signatures. NIST said the standards are ready for immediate use and encouraged early adoption because integration takes time. None of these standards, however, prescribe a specific Bitcoin migration path or validate any particular transaction-cost benchmark — and Bitcoin's fixed block space and consensus-driven upgrade process mean the network's integration problem has no direct off-the-shelf equivalent.

How Much Bitcoin Is Actually at Risk

The exposure question is separate from the cost question, and the numbers on this side are verified. CoinDesk reported, citing Glassnode data, that approximately 6.9 million BTC sat behind already-visible public keys, equal to 31.2% of circulating supply. A visible public key is one that has already been used to sign a transaction, making it readable on the blockchain.

The same report noted that exposed supply had grown by 222,000 BTC since Glassnode's May report, even as total Bitcoin supply increased by only 64,000 BTC over the same period — meaning the at-risk pool expanded more than three times as fast as the supply itself. Exchanges alone held 1.79 million BTC behind visible public keys, so a large portion of the exposed coins sit with third-party custodians rather than individual key-holders. The distinction matters because those funds are the ones most vulnerable to a quantum attack, not Bitcoin held in addresses whose public keys have never been broadcast.

An academic paper by Aggarwal et al. found Bitcoin's proof-of-work mining process relatively resistant to near-term quantum speedups but identified the elliptic-curve signature scheme as the more exposed component. That analysis reinforces why researchers focus on signature costs rather than mining when modeling a quantum migration.

Prototype work is already underway at the implementation level: a quantum-resistant Bitcoin transaction has been demonstrated on mainnet without requiring a consensus rule change, and StarkWare has executed a quantum-safe Bitcoin transaction on mainnet, showing that the building blocks for quantum-resistant spending are being tested on the live network.

What a Lower Cost Estimate Would Mean in Practice

If the Yukon benchmark's reported 82% reduction holds up under scrutiny, quantum-safe transactions could become practical at fee levels closer to today's. That matters for the feasibility of any future migration proposal, since a scheme that multiplied transaction costs by ten or more would face serious resistance from users, developers, and miners.

A benchmark, however, is not a deployment. Open questions remain on whether the result is reproducible, whether the underlying post-quantum scheme has passed a full security review, how it interacts with Bitcoin's existing script and witness formats, and how any migration would be governed and rolled out. Bitcoin Improvement Proposal 361 has already proposed protections for vulnerable wallets, a sign that the governance process for addressing quantum risk is active but far from resolved. The near-term markers to watch are straightforward: a published, auditable methodology behind the 82% figure, subsequent Glassnode updates on exposed supply, and how far BIP 361 advances through Bitcoin's review process.

For holders today, the practical takeaway is that no quantum computer currently capable of breaking ECDSA exists, and researchers are actively working to make any future migration as affordable as possible. The cost of protection remains the open question, and the Yukon benchmark, if confirmed, would represent meaningful progress on it.

Disclaimer: This article is for informational purposes only and does not constitute financial or investment advice. Cryptocurrency and digital asset markets carry significant risk. Always do your own research before making decisions.