According to FalconX co-head of markets Joshua Lim, the threat quantum computing poses to Bitcoin may first become apparent in derivatives markets, long before any stolen coins actually move on the blockchain. In an April 16 thread on X, Lim outlined what he considers the most tradable signals around a potential “q-day” event.
Lim argues that the core challenge isn’t just whether Bitcoin can technically transition to post-quantum cryptography. It’s also whether the network can politically resolve what to do with Satoshi Nakamoto’s coins and other old, dormant outputs that may never be part of such a migration.
Quantum Risk Could Manifest Through Derivatives
Lim breaks the issue into two separate questions. The first is technical: how to move Bitcoin away from the elliptic curve cryptography that currently secures private keys. The second is more complex: “How to deal with the fundamentally non-mathematical and wholly sociopolitical question of what to do with Satoshi’s coins.” He contends the greatest risk isn’t just the cryptographic breakage itself, but the governance crisis that could follow.
While a migration path for most of Bitcoin’s UTXOs is conceivable—he cites BIP 361 as one proposal addressing both post-quantum migration and Satoshi-era coins—this only solves part of the problem. Lim estimates Satoshi’s holdings at about 1.1 million BTC, with other old or lost coins in vulnerable addresses potentially raising the total exposed supply to 1.7 million BTC, a “$127bn question.”
These coins are different, he argues, because they likely wouldn’t participate in any community-led migration unless Satoshi is still active and willing to move them. This creates two uncomfortable potential outcomes for markets:
1. EITHER Satoshi is still around and can move the coins before q-day, causing BTC’s price to tank as the market reprices the probability of those coins being sold.
2. OR Satoshi is not around, and someone with a sufficiently powerful quantum computer steals the coins.
This is why, for Lim, Satoshi’s coins represent “not a math problem” but a political one. The possible responses are political choices: either burn the coins through governance—raising serious questions about immutability and precedent—or execute a hard fork, letting the market choose between a chain that neutralizes the coins and one that preserves the current rules, even with the lingering quantum risk.
Lim suggests even attempting the first option could lead to the second. “Our only prophylactic is to EITHER A) burn Satoshi’s coins via governance,” he wrote, “OR B) create a hard fork and allow for the market to decide which is the true BTC.” He believes this would likely become a political contest over Bitcoin’s identity as much as a security response, adding that the most probable quantum thief in such a scenario would be “a state-level actor.”
A Different Market Landscape
Lim then contrasts any future fork with Bitcoin’s split in August 2017, which created BTC and BCH. At that time, Bitcoin was a roughly $45 billion market dominated by retail investors, and many welcomed the fork as it created an additional asset. Today’s market is vastly different: valued around $1.5 trillion, heavily institutional, and interwoven with ETFs, listed futures, and options. This changes how risk would propagate.
“A hard fork today, or even the prospect of one, would be an entirely different beast,” Lim wrote. “It would result in extreme volatility and likely downward price action: a large gap down and massive cascading liquidations.” He added that if the community were nearly evenly split on whether to burn the exposed coins, institutional investors might be compelled to de-risk ahead of the event.The market is facing increased downward pressure. While some Bitcoin investors are optimistic about reaching $78,000, analysts at Glassnode advise caution.
Derivatives markets could provide early warning signs of a potential “q-day” risk—a scenario where quantum computing threatens cryptocurrency security. According to Lim, key indicators to watch include long-term options skew, futures basis rates, and where trading activity is concentrated.
Currently, the cost of long-term Bitcoin put options for downside protection is near multi-year highs, a level last seen during major crypto failures in 2022. Additionally, Bitcoin futures are trading at a significant discount to the spot price.
In theory, the threat of a quantum computing breakthrough should cause this futures discount to shrink or even reverse, as traders hedge against risk or position for a potential fork. Since the timing of such an event is unknown, these signals would likely appear in longer-dated contracts.
However, Lim clarifies that the market isn’t necessarily pricing in an imminent quantum event. Some warning signs are present, but they could also reflect broader market risks or structural changes, like growing institutional trading.
His main conclusion is straightforward: if a quantum threat ever becomes credible, the first signals will likely appear in derivatives markets, not from older Bitcoin wallets becoming active.
As of this report, Bitcoin is trading at $75,024.
Frequently Asked Questions
Of course Here is a list of FAQs about Joshua Lims view that Bitcoin derivatives serve as the earliest indicator of a quantum selloff designed to be clear and accessible
Beginner Definition Questions
1 What is a quantum selloff in crypto
A quantum selloff is a very rapid severe and widespread market crash where the price of an asset drops dramatically in a very short period Its like a flash crash on steroids often triggered by a cascade of automated selling
2 What are Bitcoin derivatives
They are financial contracts that derive their value from the price of Bitcoin The most common types are futures and options They are used for hedging risk or speculating on price moves
3 Who is Joshua Lim
Joshua Lim is a wellknown figure in the crypto finance world formerly the head of derivatives at Genesis Trading and now a cofounder at a cryptofocused venture firm Hes considered an expert in crypto markets and derivatives
Core Concept Mechanism Questions
4 What does Joshua Lim mean by derivatives as the earliest indicator
He means that signs of major trouble often appear in the derivatives markets before they show up in the spot market The data from futures and options can act as a warning signal
5 How can derivatives signal a selloff before it happens
Key warning signs in derivatives include
Extreme Funding Rates When the cost to hold a perpetual futures contract becomes highly positive or deeply negative it can signal an imminent market reversal or liquidation cascade
Massive Open Interest A very large number of open derivative contracts especially with high leverage means the market is a tinderbox A small price move can trigger automatic liquidations forcing the sale of Bitcoin and creating a domino effect
Options Skew A sudden shift in the pricing of put options versus call options can show where professional traders are placing their protective bets