For more than a decade, crypto’s central claim has been that mathematics offers firmer foundations than institutions. Trust, once vested in central banks and courts, could be replaced by encryption and code. Quantum computing threatens to expose how contingent that bargain really is.

Most cryptocurrencies rely on public-key cryptography. The logic is simple: generating a public key from a private one is easy; reversing the process is assumed to be impossibly hard. Classical computers would need timescales that stretch beyond civilisation itself. Quantum computers, by exploiting probability rather than brute force, could compress that gap dramatically. Problems once thought infeasible may become merely expensive.

This matters because crypto has no safety net. If a bank’s defences fail, transactions can be reversed, accounts frozen or losses socialised. In crypto, ownership is absolute and unforgiving. Whoever controls the key controls the asset. A sufficiently powerful quantum machine would not need to compromise the network - only individual wallets, many of which were created under far laxer security assumptions than today’s.

The risk is unevenly distributed. Early wallets, reused addresses and long-dormant holdings form a soft underbelly. Estimates suggest a material share of outstanding coins could be theoretically vulnerable. That prospect has begun to surface in institutional risk disclosures and policy discussions, an uncomfortable development for an industry seeking respectability.

Optimists argue that this is merely another upgrade cycle. Cryptography has evolved for centuries, and “quantum-resistant” algorithms already exist. Blockchains, in principle, can migrate. Yet such transitions require coordination, governance and trust - precisely the frictions crypto was designed to avoid. Proposals to invalidate or burn vulnerable coins would protect networks only by violating property rights, undermining the very ethos they claim to defend.

Quantum computing will test all digital infrastructure, from payments to communications. Crypto, however, is uniquely exposed because its value rests almost entirely on self-custody and confidence. If investors begin to doubt that their keys are truly theirs, the narrative of “digital gold” weakens.

Quantum machines may not arrive tomorrow. But by reminding markets that code is fallible and security is temporary, they cast a long shadow over crypto’s claim to permanence.

A summit yesterday at the White House highlighted the stubborn divide over how America regulates digital assets. Officials brought together representatives from traditional banks and cryptocurrency firms in a bid to bridge differences that have stalled key legislation, but emerged with no consensus.

At the heart of the stalemate is a seemingly technical, but economically consequential, question: should legislation allow stablecoin issuers and crypto platforms to offer interest or rewards to customers? Banks argue that permitting yield on stablecoins could drain deposits from insured lenders - the primary funding source for loans to households and small enterprises - with adverse implications for financial stability. Crypto firms counter that interest and similar incentives are central to attracting users in a competitive market.

This impasse has held up the Clarity Act, a long-awaited framework intended to give digital assets a clear federal regime. The House of Representatives approved its version last year, but in the Senate progress has stalled amid inter-industry tensions and uncertainty about whether there is enough support to advance the bill to the full chamber.

Both sides described the White House meeting as constructive. But “constructive” now seems to have become a synonym for “no breakthrough”. Banking lobby groups have emphasised the need to protect the traditional financial system, even as crypto advocates warn that over-tight restrictions could hamper innovation and cede market share to overseas competitors.

The failure to agree also underscores broader political dynamics. The Republican administration has signalled support for positioning the US as a leader in crypto innovation, but midterm politics and intra-party divisions complicate the path to durable legislation.

Without compromise on stablecoin treatment, further meetings are expected - but the risk that legislative inertia becomes the default outcome is growing

Britain is not the easiest place to be a crypto trader. The watchdog frowns on hype, promotions are policed, and firms are pushed towards grown-up disclosure. Yet that is precisely why a serious holder should think twice before decamping to the bright lights of Dubai.

Start with rules. The FCA has now set out a clear path towards a full authorisation regime for cryptoasset activities, with the new framework expected to commence on 25 October 2027. That may sound distant, but it matters today: jurisdictions that keep rewriting the playbook tend to do so mid-cycle, often after losses. Britain, by contrast, is signalling where it is headed and inviting industry to help shape the plumbing.

Then there is the direction of travel in mainstream finance. The Bank of England has made tokenised collateral and systemic stablecoins priorities for 2026, and is openly exploring broader acceptance of tokenised assets as collateral. The Digital Securities Sandbox is explicitly designed to let firms issue, trade and settle digital securities under joint FCA-BoE oversight. Add the government’s push to modernise wholesale markets - including workstreams on stablecoins and tokenised deposits - and the UK looks less like a backwater and more like a testbed for regulated tokenisation.

Taxes are rarely fun, but at least they are legible. HMRC’s headline CGT rates and allowances are published and stable enough to plan around, even if they are not generous. For active traders, “boring” administration is a feature: banks, accountants and counterparties understand it and it’s hard to get stung later down the line.

For crypto, credibility is compounding. London is building the rails. If you intend to keep making money when the music slows, it helps to be somewhere that insists on a score.

Nothing in life is free. Crypto is volatile, when others are fearful, therein lies opportunity