An executive at ZK-proof firm StarkWare has outlined a method for shielding Bitcoin transactions from quantum computer attacks without requiring any changes to Bitcoin's core protocol. Avihu Levy, StarkWare's Chief Product Officer, published the proposal around April 9 to 10, 2026, calling the scheme Quantum Safe Bitcoin (QSB), which has been widely described in coverage as a "last-resort measure" rather than a permanent fix.

What QSB Does and How Much It Costs

QSB works by replacing the signature algorithm that Bitcoin currently uses, known as ECDSA, with cryptographic proofs built on a different mathematical foundation called hash-based cryptography. The proposal evolved from an earlier concept called Binohash, which carried residual quantum vulnerabilities; QSB represents a more mature iteration of that design. The practical upside is that a quantum computer attacking this type of proof is limited to a slower method called Grover's algorithm, which provides only a partial speed advantage. By contrast, a quantum computer running Shor's algorithm against a standard Bitcoin transaction could theoretically recover the private key outright.

The tradeoff is cost. Each QSB transaction runs between $75 and $200 to generate, using commodity cloud GPUs. A standard Bitcoin transaction currently costs around $0.33. That gap is not a rounding error: at the lower end of the cost range, QSB is roughly 227 times more expensive than a standard transaction, and at the upper end it is roughly 606 times more expensive.

QSB transactions fall outside Bitcoin's standard peer-to-peer relay policy limits, so they must be submitted directly to miners through specialized bypass services such as Slipstream. That requirement rules out Lightning Network payments and Layer 2 applications entirely.

Why Anyone Would Use It Anyway

Bitcoin's dominant security assumption, that deriving a private key from a public key is computationally impossible, holds against classical computers but not against a sufficiently powerful quantum machine. Approximately 6.5 million BTC is considered exposed in some form, according to prior CoinDesk reporting from April 4, 2026. About 1.7 million of those coins sit in older address formats that permanently display the public key on-chain. This category includes coins attributed to Satoshi Nakamoto.

The most widely discussed long-term protocol solution is BIP-360, a protocol upgrade that would introduce a new quantum-resistant address type. The problem is that Bitcoin upgrades move slowly. Taproot, Bitcoin's last major protocol change, took 7.5 years from proposal to activation. BIP-360 remains a draft as of April 2026, with no activation timeline confirmed. BTQ Technologies demonstrated a BIP-360-compatible transaction on testnet in March 2026, though testnet demonstrations have not historically accelerated Bitcoin's mainnet activation timelines.

QSB fills this gap precisely because it requires no coordination at all. No miner signaling, no community signaling, no new opcodes. It runs on the live network today, which is its core selling point for anyone who needs protection before a formal upgrade arrives.

Nobel Prize-winning physicist John Martinis, one of the pioneers of quantum computing hardware, put the underlying risk plainly in a CoinDesk interview published April 7, 2026: "It's not something that has zero probability; people have to deal with this." He estimates a 5 to 10 year window before cryptographically relevant quantum machines emerge, but he stressed that uncertainty should not be read as comfort. "Breaking cryptography is one of the easier applications for quantum computing, because it's very numeric," Martinis said. Some analysts have projected the threat could emerge as early as 2029; separately, Google researchers have estimated that a capable machine could crack Bitcoin's cryptography in under nine minutes once available.

What This Means for South Asia and Africa

For retail users in India and Nigeria, the two countries that rank first and second on the 2026 Global Crypto Adoption Index, QSB has limited immediate relevance. A $75 to $200 transaction fee prices out virtually all everyday crypto activity in both markets, where typical transfers are small-ticket, peer-to-peer, and increasingly stablecoin-driven. Sub-Saharan Africa recorded stablecoin adoption growth of over 180 percent year-over-year, according to the 2026 index, and Nigeria ranks first globally in on-chain DeFi value. Pakistan (#8), Ethiopia (#10), and Kenya (#13) on the adoption index illustrate how broadly distributed crypto engagement is across both regions, with each country representing a distinct exposure profile.

The quantum threat lands differently for institutional holders and high-net-worth individuals in these regions who hold Bitcoin as a store of value against currency depreciation. That cohort has a direct stake in whether Bitcoin's long-term cryptographic security holds. Regulators in African markets, including Ghana, Namibia, Botswana, and Seychelles, are developing or refining crypto frameworks; any credible debate about Bitcoin's security model could shape how those regulators write risk disclosure requirements and reserve requirements for licensed virtual asset service providers (VASPs), a category that includes exchanges, custody providers, and brokers.

African Bitcoin holders also carry a structural vulnerability worth noting. Wallet reuse and older address types are more prevalent in markets where users access crypto through informal or legacy infrastructure. These are precisely the wallet configurations most exposed in a quantum attack scenario. The QSB design philosophy also carries specific relevance for developer and infrastructure communities in South Asian tech hubs such as Bangalore, Hyderabad, and Karachi, and in African tech hubs such as Lagos, Nairobi, and Accra, where contributors to Bitcoin and Web3 tooling have a near-term stake in how quantum-resistant transaction standards take shape.

What Comes Next

QSB is not a replacement for BIP-360, and Levy did not present it as one. The more meaningful question now is whether Bitcoin's governance process can move faster than the quantum computing industry. A stopgap that costs $200 per transaction and bypasses the standard network relay is, at best, a bridge for the highest-stakes holders. The broader network will need a coordinated protocol upgrade. How long that takes, given Taproot's 7.5-year precedent, is the open question that QSB cannot answer.