THE COMPUTE COST OF A QUANTUM SAFE BITCOIN TRANSACTION FELL ABOUT 79 PERCENT IN ONE WEEK — FROM ROUGHLY $320 TO SOMEWHERE BETWEEN $66 AND $67 — AND THE OUTLETS DO NOT AGREE ON WHICH

In August someone put the first quantum resistant transaction on bitcoin mainnet. It took about 3,100 GPU hours and cost roughly $320 in compute. StarkWare, Yukon Research and Eigen Labs then opened a contest to make that cheaper, with twenty thousand dollars in prizes from StarkWare, an additional prize from Yukon, and a public leaderboard. A week later the number is under seventy dollars.

The technique is not elegant and does not need to be. You are grinding. The benchmark measures how many independently verified candidates a single GPU can produce per second, across two workloads called transaction pinning and subset selection. Nobody found a new idea. They found a pile of accepted improvements to an old one.

Be careful with the exact figure, because the outlets are not saying the same thing. The Quantum Insider and Cointelegraph put it at about $67. Crypto Briefing puts it at $66. StarkWare's own challenge page confirms the $320 starting point and the 3,100 GPU hours but does not publish a closing number, so the final figure is outlet reporting and not the source. The arithmetic lands in the same place either way. Two hundred and fifty three dollars off three hundred and twenty is 79.1 percent. Two hundred and fifty four off three hundred and twenty is 79.4 percent. Both round to 79, which is why you should not trust anyone who writes 80.

What this changes is not whether bitcoin needs an answer to quantum. It changes what the answer costs to use. A last resort you cannot afford to exercise is not a last resort. At sixty seven dollars a transaction it is expensive and real. At three hundred and twenty it was a demonstration. At the time of this writing, bitcoin was $83,975.