The estimated computational cost required to prepare a quantum-resistant Bitcoin transaction has fallen significantly, dropping below $67 after a week of intensive optimization efforts. This represents a substantial decrease from the roughly $320 spent to execute the very first transaction of its kind on the Bitcoin mainnet back in August, according to data provided by StarkWare.
The dramatic price reduction comes in the wake of the Quantum-Safe Bitcoin Optimization Challenge, an event that brought together developers, researchers, and participants from across the tech community to discover new ways to streamline the heavy graphics processing unit (GPU) calculations required to construct a quantum-safe Bitcoin transaction.
While these major cost reductions make the experimental defense mechanism considerably more practical for everyday Bitcoin holders looking to safeguard large balances, the latest optimizations have thus far only been successfully demonstrated within benchmark testing environments.
"A construction that costs a few hundred dollars per transaction is a demo. One that costs $67 is closer to something a holder with a large unexposed balance might reach for in an emergency," StarkWare noted in an official update published on September 23. Following the initial announcement, live dashboard tracking data indicated that the estimated cost has continued to edge lower, dropping further to approximately $66.
Quantum-Safe Bitcoin an “Emergency” Solution
The underlying technology stems from work by StarkWare researcher Avihu Levy, who initially published the Quantum-Safe Bitcoin (QSB) design framework in April. The architecture outlines an innovative method designed to incorporate hash-based cryptographic protections against future quantum computing attacks without requiring any disruptive modifications to Bitcoin’s foundational consensus rules. At the time of its unveiling, Levy described the approach strictly as a "last resort measure" due to its elevated costs, technological complexity, and limited overall applicability, while continuing to voice his ongoing support for comprehensive protocol-level changes over the long term.
The first practical execution of a QSB transaction took place on August 26, when it was successfully mined and confirmed on the Bitcoin mainnet. The milestone achievement was made possible through engineering efforts led by Tomer Giladi, with the raw transaction submitted directly through the mining firm MARA’s specialized Slipstream service. However, preparing that initial transaction was resource-intensive, demanding approximately 3,100 GPU-hours distributed across roughly 100 individual GPUs. This resulted in an estimated direct compute cost of around $320, a figure that did not even account for standard Bitcoin network transaction fees.
Recognizing the urgent need to bring these high expenses down to a more viable threshold, StarkWare teamed up with Yukon Research and Eigen Labs to launch the QSB optimization challenge on September 16. The collaborative initiative issued an open invitation to developers, independent researchers, and autonomous artificial intelligence agents alike, challenging them to optimize the transaction-building software to make it significantly faster, lighter, and more resource-efficient.
In its recent update, StarkWare reported that the challenge successfully yielded 62 accepted technical improvements targeting the two core computational tasks necessary to prepare a QSB transaction. According to the organization’s comprehensive evaluation, these combined enhancements succeeded in cutting the estimated computing cost by roughly 79 percent, based on standardized benchmark tests.
This technical race against the clock unfolds against a backdrop of mounting concern within the broader cryptographic community. Experts warn that as quantum computing hardware continues to advance, a sufficiently powerful quantum computer could eventually break the elliptic-curve digital signatures that currently secure the Bitcoin network. Such a vulnerability would potentially grant malicious actors the ability to compromise and steal funds from Bitcoin addresses whose public keys have already been exposed on the blockchain.
In response to these looming threats, cryptographic researchers are actively developing various layers of quantum-resistant protections, of which QSB is one notable example. Nevertheless, StarkWare has maintained that it still views a soft fork—a deliberate, backward-compatible change to Bitcoin’s underlying consensus rules—as the superior and more permanent "long-term answer" to secure the entire Bitcoin network against quantum decryption threats.
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