Bitcoin holders woke up to a rather nasty shock this Friday. The market has taken a severe beating, dragging the cryptocurrency to its lowest level in over a year. It’s a far cry from the dizzying heights of last October, when Bitcoin shattered records to peak at a staggering $126,210.50. Today, we’re looking at a valuation effectively halved. This slide hasn’t been a sudden flash crash; it’s the culmination of a grim downward trajectory over the last few months, punctuated by a particularly brutal sell-off earlier this year in January and February.

What’s driving the rot? For starters, institutional cash is fleeing. Investors are yanking their capital out of US spot Bitcoin ETFs at an alarming rate, with major players like BlackRock feeling the pinch. Throw in some rather blunt rhetoric from US Treasury Secretary Scott Bessent, who essentially told the market not to expect any government bailouts, and you have a perfect storm for panic selling.

But the headwinds aren’t just coming from across the Atlantic. Here in the UK, the days of the crypto Wild West are well and truly numbered. The Treasury has laid out the roadmap for sweeping legislation coming into force next year in 2027, which will finally see digital assets regulated with the same rigour as traditional stocks and shares.

Under the new framework overseen by the Financial Conduct Authority (FCA), crypto exchanges and digital wallet providers will have to meet stringent standards designed to drag the industry into the light. We’re talking enhanced transparency, robust mechanisms to detect suspicious activity, and the very real threat of sanctions for firms that step out of line. It’s a necessary maturation for an asset class that has exploded as a legitimate alternative investment, aiming to offer consumers a safety net that has historically been non-existent. Firms already have to register with the FCA regarding money laundering, but this impending overhaul changes the game entirely.

Yet, while traders sweat over ETF outflows and FCA compliance, a far more existential headache is brewing in the background. A recent report from Coinbase has highlighted a glaring technical vulnerability: up to 6.9 million Bitcoin—roughly a third of the total supply—are sitting ducks for a future quantum computing attack.

The issue lies deep within Bitcoin’s cryptographic plumbing. The network relies on the Elliptic Curve Digital Signature Algorithm (ECDSA) to prove ownership. Classical computers would need thousands of years to reverse-engineer a private key from a public one. A sufficiently powerful quantum computer, however, running Shor’s algorithm, could theoretically crack it in polynomial time.

Not all wallets are equally exposed. The risk is heavily concentrated in two specific areas:

• Older Pay-to-Public-Key (P2PK) addresses, a legacy format where the public key is inherently visible on the blockchain.

• Wallets where users have lazily reused the same address for multiple transactions, stripping away their cryptographic anonymity layer with each use.

If your public key is already out there, a vital layer of defence is gone. Interestingly, the proof-of-work mining mechanism, governed by SHA-256, is also theoretically vulnerable to Grover’s algorithm, though Coinbase considers this a far less pressing issue than the immediate threat to individual wallets.

So, how long do we have? The goalposts are shifting uncomfortably fast. Previously, it was assumed that breaking Bitcoin’s encryption would require millions of physical qubits. But a Google Quantum AI whitepaper published just a few months ago in March 2026—co-authored with heavyweights from Stanford and the Ethereum Foundation—drastically revised that estimate. They suggest that fewer than 500,000 physical qubits (translating to around 1,200 to 1,450 logical qubits) could be enough to crack Bitcoin’s secp256k1 curve. That is a twenty-fold reduction from older models.

Google is already aiming to migrate its own systems to post-quantum cryptography by 2029. Coinbase CEO Brian Armstrong has pragmatically dubbed the quantum threat a “solvable problem,” provided the industry doesn’t bury its head in the sand. Security chief Jeff Lunglhofer echoed this, noting that while the sheer processing power of quantum tech is terrifying, an acute threat is realistically still a decade away.

The roadmap for survival is already being drawn up. Back in August 2024, the US National Institute of Standards and Technology (NIST) finalised three post-quantum cryptographic standards (FIPS 203, 204, and 205). Building on this foundation, Coinbase has assembled a formidable Quantum Computing Advisory Board, pulling in top minds like cryptographer Dan Boneh, quantum specialist Scott Aaronson, and Ethereum researcher Justin Drake. Their remit is straightforward: cut through the hype, assess the genuine risks objectively, and forge a post-quantum migration strategy before the hardware catches up with the theory.