The Tech Was Never the Hard Part | MJBurrows Crypto - Issue No 7

Bitcoin's quantum problem is a voting problem

Crypto's quantum reckoning finally has a date on it. Consensus among the firms building quantum computers now points to 2029 for a machine that could break the cryptography signing every Bitcoin transaction — and, for what it's worth, every bank's rails too. The twist is that the maths is the solvable part. Post-quantum defences will be ready well before that Q-Day; a bank can adopt them with a board resolution and a budget. Bitcoin can't. Any fix needs roughly 90% of miners to agree first, on a network with no boss — and the last big upgrade fight, over SegWit in 2017, split the chain into Bitcoin Cash and Bitcoin Gold. Bitcoin's cryptography isn't the fragile part. Its constitution is.

A rulebook that decides who does the buying

There's a governance story on the commercial side, too. Fewer than 20% of Europe's banks offer any crypto service — against roughly three-quarters in Switzerland — and Britain's incoming FCA rulebook looks set to decide who closes that gap. Rather than build a standalone regime like the EU's MiCA, the FCA folds crypto into the machinery that already governs investment firms: the same capital and client-asset demands, with customer coins segregated under trust. For a bank, that's a familiar extension; for a crypto-native startup, it's a governance-and-custody build from scratch, with an eye-watering bill long before any revenue. The likely upshot isn't a wave of new licences but a wave of acquisitions — a door meant to let challengers in mostly deciding who ends up buying them.

Two stories, one lesson: crypto's next chapter turns less on breakthroughs than on who gets to decide — a room full of miners, and a rulebook full of banks. The cards below, then the rest of the issue. — MJB

Every encrypted system on the planet faces the same quantum computing threat, from your bank’s rails to the Bitcoin blockchain. But only the blockchain has to hold a vote about it. Consensus now points at 2029 for a machine capable of breaking the cryptography underneath both — and the maths, oddly, is the part that looks solvable. It is the voting that doesn’t.

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Fewer than 20% of Europe’s banks offer customers any kind of crypto service. In Switzerland, however, roughly three-quarters of the leading banks already do. That gap is not about technology — it is about who feels legally safe enough to move, and the FCA crypto rules now being drafted in London will decide which firms get to. The rulebook was written to let newcomers in. Its likelier effect is to make them worth buying.

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Bitcoin can probably survive a quantum computer; the open question is whether it can survive a committee. The maths to defend it will be ready years early — it's the vote to install it that nobody can schedule. For an asset that prides itself on having no boss, today was a reminder that no boss also means no one to sign off the upgrade. — MJB