StarkWare’s coding contest cuts quantum-safe Bitcoin transaction cost to $66

Getting a Bitcoin transaction quantum-proofed used to cost around $320 in GPU compute time. After a week-long coding contest, that number is now roughly $66. That is an 80% cost reduction achieved largely by developers and AI tools competing for prize money.

StarkWare, working alongside Yukon Research and Eigen Labs, launched the Quantum-Safe Bitcoin Optimization Challenge on September 16, 2026. By September 23, the contest dashboard showed 62 accepted improvements had pushed estimated preparation costs down to between $66 and $67.

What quantum-safe Bitcoin actually does

Bitcoin’s current security model exposes public keys during transactions. A sufficiently powerful quantum computer could, in theory, reverse-engineer a private key from a public one, draining a wallet before the owner could respond.

QSB is an emergency workaround built entirely inside Bitcoin’s existing rules. It uses hash-based cryptographic locks that provide roughly 118-bit preimage resistance. It requires no soft fork, no consensus changes, and no protocol upgrades.

The design was published in April 2026 by StarkWare researcher Avihu Levy. The first actual QSB transaction on the Bitcoin mainnet landed on August 26, 2026, recorded in block 964,199. That transaction consumed approximately 3,100 GPU-hours and cost around $320 to prepare.

How a $20K contest moved the needle

The optimization challenge offered over $20,000 in prizes and attracted contributions from both human developers and AI-assisted workflows.

One standout metric: transaction pinning throughput on an RTX 4090 GPU jumped from roughly 146 million candidates per second to more than 820 million candidates per second. That is more than a fivefold increase in processing speed for the same hardware, which directly translates into fewer GPU-hours needed and a lower dollar cost to prepare a QSB transaction.

The 62 accepted improvements collectively drove the 79% cost reduction reflected in the benchmark results.

StarkWare’s view is that as costs continue falling toward the single-digit dollar range, QSB becomes a realistic emergency option for high-balance Bitcoin holders.

A stopgap with serious limitations

StarkWare has been explicit that a comprehensive soft fork remains the preferred long-term strategy for Bitcoin’s quantum resilience. QSB is classified as an experimental solution, positioned specifically as an emergency measure for situations where a public key may already be exposed or at imminent risk.

A soft fork could protect all Bitcoin users at the protocol level. QSB protects individual wallets, one expensive transaction at a time, for holders who choose to use it and can afford the compute cost.