Optimization Competition Slashes Cost of Quantum-Resistant Bitcoin Transactions

The estimated cost to construct a quantum-resistant Bitcoin transaction has plummeted by nearly 80% in a single week, dropping from approximately $320 to around $67. This significant reduction is the outcome of an optimization competition organized by StarkWare, Yukon Research, and Eigen Labs.

The competition followed the mainnet mining of the first quantum-safe Bitcoin transaction last month. The initial construction required an estimated 3,100 GPU-hours and cost about $320. Within a week of the competition’s launch, this cost was substantially lowered.

According to StarkWare, the cost savings stem from raw speed improvements in the code. The most intensive part of the process occurs on a user’s hardware before data reaches the blockchain. This involves a brute-force search to find a valid hash output that fits where a signature is typically expected. As only about one in 70 trillion hash outputs meet the required format, finding a match requires repeated hashing. Faster code directly reduces the GPU-hours needed.

Performance benchmarks saw dramatic gains, with one core metric improving from 146 million verified candidates per second to over 820 million on a standard RTX 4090. These advancements were achieved across multiple improvements in two competition tracks.

Notably, developers leveraging AI models achieved the leading optimization records. StarkWare cited Anthropic’s Opus 5 and Fable 5.1 as top performers, with OpenAI’s GPT-6 Astra, Grok 4.6, and Kimi also ranking highly.

StarkWare has cautioned that the $67 figure is an estimate based on specific hardware assumptions, not a fixed market price, and it continues to fluctuate as new records are set. The company also emphasized that these optimizations do not make Bitcoin fully quantum-safe on their own. The transactions are non-standard, requiring direct transmission to a miner, and this method only protects coins whose public keys have not yet been exposed.

StarkWare maintains that a network-wide soft fork remains the more robust long-term solution for Bitcoin’s quantum security. This development occurs amid growing focus on Bitcoin’s vulnerability to ‘Q-Day,’ a hypothetical future point when quantum computers could potentially break the elliptic-curve cryptography securing cryptocurrency wallets. In response, firms like Coinbase are reportedly developing post-quantum custody strategies.

Why This Matters

The materials describe a narrow update: An open competition to optimize the code for quantum-resistant Bitcoin transactions resulted in a nearly 80% reduction in the estimated cost of constructing such a transaction within a week. The $67 cost is an estimate under stated hardware assumptions, not a market price.

Broader Context

Source materials place the factual news in this context: The price of building a quantum-resistant Bitcoin transaction has plunged nearly 80% in a single week, after developers and AI models competed to optimize the code behind it.