Bitcoin’s code is learning to outrun quantum machines

Cryptocurrency prices jump around all the time, but behind the scenes, the teams building and refining Bitcoin and the rest of the crypto ecosystem are moving faster than a glance at the numbers lets on.

Bitcoin traded at $82,413.19 at on 8 October, 2026, based on Fortune’s daily tracker. It was a pretty quiet day, at least by crypto’s standards. But, that same day, deep inside the developer mailing lists, people were busy hashing out one of Bitcoin’s most ambitious security upgrades ever.

People love to obsess over price charts, but if you’re a tech person, you probably care more about what’s under the hood. Over the last couple of years, a lot has matured: Everything from cryptography research to stablecoin mechanics to big institutional products.

Even the way people pay tells the story. Binance, the world’s largest exchange, listed USDT price in India at ₹104.11 per token on its peer-to-peer market on 9 October, 2026. The “official” market rate was ₹96.73. That tells you something right away: A stable, dollar-based token such as Tether is being used far from Silicon Valley, just like Bitcoin is, and the difference between those prices shows how real-world liquidity really shapes local prices.​

​How has Bitcoin been preparing for the era of quantum computers now?

The devs are working on an upgrade called BIP-360. It went into the official proposals repository on February 11, 2026. The idea centres on a new output called Pay-to-Merkle-Root, as per Phemex. Basically, this removes one spending path that a super-powerful quantum computer could, in theory, exploit one day.

Don’t get too excited, “merged” just means the proposal is ready for official, serious discussion. It doesn’t mean the upgrade’s live yet. But, right before all this, Ethan Heilman started a debate about algorithm agility on the mailing list, and it’s moving fast: What started as theory is now becoming code, according to PostQuantum.

There’s already a follow-up, BIP-361, which is a little trickier because it deals with coins that have already shown their public keys out in the open, according to Bitcoin.org.

What are the “official” standards saying about quantum threats?

The U.S. National Institute of Standards and Technology (NIST) has already wrapped up the groundwork. Back in August 2024, they put their first three post-quantum encryption standards in place and told organisations to start switching, now, as per a news release from NIST.

Here’s the stark part: NIST says some experts believe a quantum computer strong enough to break today’s encryption could arrive within a decade. That means Bitcoin’s engineers are starting from tested, official algorithms, not guesswork. Bitcoin’s upgrade proposals are named ML-DSA and SLH-DSA, straight from NIST’s playbook.

What’s the practical cost of quantum-proofing Bitcoin?

Well, you need more space. An ML-DSA-44 signature takes up 2,420 bytes. That’s massive compared to today’s very neat, small Bitcoin signatures, according to Quantum Zeitgeist.

Bigger signatures mean each block holds fewer transactions, which can push up fees unless devs find clever workarounds. Engineers are already exploring things like signature aggregation and cheaper block space for the new signatures. It’s the classic engineering trade-off: You get long-term security, but you pay for it with less efficiency.

Are big players backing all these changes?

Yes, they are. Just look at Citigroup: On 1 October, 2026, they raised their 12-month Bitcoin target from $82,000 to $113,000. They pointed to stronger crypto activity, a positive macro climate and a return of ETF inflows making them feel more confident, as reported by Binance.

Of course, a forecast isn’t a promise, and Bitcoin reacts to big world news as much as anything else. Still, when a massive bank gets more bullish, it means folks in traditional finance are warming up to the technology and what’s being built around it.

Why do crypto tech upgrades matter as signs of progress?

Because the current markets reflect what good engineering really delivers. One recent example: Binance Research reported that in the first 32 days of the 2026 Middle East conflict, Bitcoin went up about 1%, while the S&P 500 fell 8%. They credited things like 24/7 market access and strong institutional demand.

The same research group also wrote in its mid-year report that quantum risks for Bitcoin’s cryptography have finally moved from being just a research topic to a real-life migration plan. That mirrors how the regular web shifted from HTTP to HTTPS: Real systems in live use harden over time, step by step, and the upgrade plans start years before the actual threat shows up.

FAQ

Does BIP-360 make Bitcoin quantum-proof?

No, it reduces exposure of public keys but doesn’t add new post-quantum signature schemes yet. Future proposals will have to do that work.

Why is signature size such a big deal for Bitcoin?

Bigger signatures eat up more block space, which can raise transaction fees. That’s why engineers are racing to figure out ways to combine or shrink them.

Author: Pam Brown

Pam Brown is a journalist with exceptional analytical skills and a strong interest in modern financial systems. She specialises in translating complex topics like crypto, loans, and forex into clear, accessible content. Pam’s precise, research-driven writing has made her a trusted voice in the financial and fintech space.