The Bitcoin Beacon
The Czech National Bank bought bitcoin for a test portfolio, then its board refused to add it to official reserves. The experiment runs anyway.
While Washington spent the week outlawing a digital dollar and El Salvador kept buying bitcoin in public, a European central bank was quietly running the experiment neither of them will: holding a little bitcoin to see what it does to the books. The Czech National Bank is not a bitcoin evangelist. It is a cautious institution testing a hypothesis, and the test itself is the news.
Governor Aleš Michl has spent a year making an argument that would have been unthinkable from a central banker a decade ago: that a small bitcoin allocation could improve a reserve portfolio. His pitch is not ideological. It is a diversification claim, dressed in the language of risk-adjusted return.
The CNB manages roughly $180 billion in foreign-exchange reserves — an unusually large pile for a country its size, worth close to 44% of GDP. Michl’s internal research, he says, found that adding as little as 1% bitcoin would lift the portfolio’s expected return while leaving overall risk roughly unchanged, because bitcoin’s long-run correlation with the bank’s other reserve assets is low. At various points he has floated going as high as 5%.
That is the entire case, and it is worth stating plainly because it is so different from the usual reasons states touch bitcoin. This is not a hedge against a failing currency, as in Bolivia, nor a sovereign statement, as in El Salvador. It is portfolio theory: an asset with low correlation can reduce the variance of the whole, even if the asset itself is volatile.
Not a hedge, not a statement — a diversification trade dressed in a central banker’s caution.
Talk became action, briefly. The CNB opened a small test portfolio that has been operational since October 2025, and in November it made its first-ever digital-asset purchase — a roughly $1 million experimental basket that included bitcoin alongside a dollar stablecoin and a tokenised deposit. The point was to learn the operational mechanics of custody, settlement and accounting, not to move the reserve needle.
Then the institution’s caution reasserted itself. In February 2026 the CNB’s Bank Board formally voted against including bitcoin in the official foreign-exchange reserves. Michl kept campaigning — he took the argument to the Bitcoin 2026 conference in Las Vegas in the spring, telling the audience “this is the future” — but the governor’s enthusiasm and the board’s vote point in different directions. The test portfolio runs on; the real reserves stay bitcoin-free.
The caution is defensible. A central bank’s reserves exist to be boring — liquid, stable, available in a crisis — and a 19%-in-a-month drawdown, the kind bitcoin delivered as recently as this summer, is exactly what a reserve manager is paid to avoid. There are reputational and legal questions too: a Eurozone-adjacent central bank holding bitcoin invites scrutiny from the ECB and from a public that expects its reserves in gold and government bonds, not in an asset it associates with speculation.
Michl’s answer is that 1% is small enough that even a total loss barely dents the portfolio, while the upside and the diversification are real. Both things can be true. The board simply decided that “small enough to survive being wrong” is not the same as “worth being right about” — not yet.
The plan is to run the trial for about two years and publish the results. That makes the CNB something rare: a central bank generating public, auditable data on what a bitcoin sleeve actually does to a sovereign reserve portfolio. If the numbers come back the way Michl expects, other reserve managers who have watched from a safe distance lose their excuse for not looking. If they come back badly, the sceptics get their proof too. Either way, the honest experiment is the contribution.
Prague is doing what almost no central bank will: testing bitcoin in the open, with real money, and reporting back. Its own board won’t yet commit the reserves, which is the whole point — this is an experiment, not an endorsement. In two years it should produce the one thing the debate has always lacked: data.
Editor’s note: reporting here is drawn from coverage of Michl’s April–May 2026 remarks and the CNB’s late-2025 test purchase; the Bank Board’s February 2026 vote against official inclusion still stands as of writing. The $180B reserve, 1% and 5% figures are Michl’s own framing via secondary coverage, not an audited CNB balance sheet. Verify before quoting.
Free. Five minutes. No hype.
Subscribe free