TL;DR

• Coinbase’s Quantum Advisory Council says post-quantum migration planning should begin before quantum attacks become practical.
• The report estimates about 7 million BTC are quantum-vulnerable because public keys are exposed through legacy formats or address reuse.
• About 1.7 million BTC are said to sit in legacy Pay-to-Public-Key addresses, including early mined and potentially abandoned coins.
• The council frames the issue as a long-term governance challenge, not an immediate emergency.

Coinbase’s Quantum Advisory Council has warned that Bitcoin and other crypto networks need to begin planning for post-quantum migration well before quantum computers can realistically break today’s public-key cryptography.

In a June 11 report titled “Post-Quantum Migration and Abandoned Coins,” the council framed the issue as both a technical migration problem and a governance dilemma. The core question is not only how to move users to quantum-safe addresses, but what the network should do about coins that are never migrated.

The report says no current quantum computer can break the cryptography securing crypto assets today. However, it argues that the risk is strategically important because decentralized ecosystems can take years to coordinate major upgrades, especially when user funds, abandoned wallets, and property rights are involved.

Why Some Bitcoin Is More Exposed

The Coinbase report estimates that roughly 7 million BTC are currently quantum-vulnerable. That figure includes coins in address types where public keys are already visible, as well as coins tied to address reuse, where a public key becomes exposed after a transaction is broadcast.

One especially sensitive category is legacy Pay-to-Public-Key addresses. The report says about 1.7 million BTC are held in these P2PK addresses, where public keys are directly visible. That bucket includes early mined coins, including coins associated with Bitcoin’s earliest history, as well as funds that may be lost or abandoned.

The issue is different from an ordinary software upgrade. Active users can be told to move funds to quantum-safe addresses once suitable signature schemes are ready. Abandoned coins, lost wallets, and dormant early addresses are harder because nobody may be available to move them.

The Governance Dilemma

The council outlined several broad paths. One option is a hard migration deadline, after which non-migrated vulnerable funds could be frozen or burned to prevent future quantum theft. That approach prioritizes network safety but raises serious property-rights questions.

A second option is to preserve rights and do nothing, leaving vulnerable coins untouched. That avoids forced intervention but could allow future attackers to steal exposed funds if quantum capabilities eventually become strong enough.

The report also discusses middle-ground ideas. These include rate-limiting how much can be moved from older addresses in any one block-like time interval, sometimes described as an hourglass mechanism, and using zero-knowledge proofs such as BIP-361 to let users prove ownership of old keys without exposing sensitive information.

Planning Before The Crisis

The council’s practical recommendation is to separate engineering work from the governance fight. In other words, the industry can start building and testing quantum-safe signatures now while still debating how abandoned or vulnerable coins should be handled later.

That distinction matters. Waiting until quantum attacks are imminent would leave networks trying to coordinate technical upgrades, wallet migrations, exchange support, and community governance under pressure. Starting early gives developers and users more room to test systems and avoid rushed decisions.

For Bitcoin holders, the takeaway is not that coins are suddenly unsafe today. It is that long-lived digital assets need long-lived security planning. The more value sits in crypto networks over decades, the more important it becomes to plan for cryptographic transitions before they become emergencies.

Coinbase’s report adds another major voice to that conversation. The debate over abandoned coins will not be easy, but the council’s message is clear: the post-quantum migration question is no longer theoretical enough to ignore.

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Bitcoin traders have identified Michael Saylor as a new suspect in the latest sell-off, while the numbers tell a different story.

Strategy disclosed in a June 1 Form 8-K that it sold just 32 BTC between May 26 and May 31 for $2.5 million, at an average net price of $77,135, with proceeds earmarked to fund preferred-stock distributions.

The company still held 843,706 BTC as of May 31, with that sale representing 0.0038% of Strategy’s total holdings and roughly 0.014% of Bitcoin’s reported daily volume of $17.45 billion on that day.

A sale of that size carries no supply-side weight against a $17 billion daily market, and it lands as a narrative event that cracks a story traders had built their confidence on.

Bitcoin fell below $71,500 after the disclosure, a drop also attributed to Iran-related geopolitical tensions and over $90 million in BTC-tracked futures liquidations, making Strategy’s sale one of several.

The bigger sellers hiding in May

Four other companies accounted for the bulk of public treasury Bitcoin reductions in May, and their combined total dwarfed Strategy’s sale.

According to BitcoinTreasuries, public-company Bitcoin reductions totaled roughly 7,500 BTC during the month, with Strategy’s 32 BTC counted in the following month’s tally because of its June 1 filing date.

Excluding Strategy, MARA cut 3,386 BTC, Core Scientific reduced by 1,990 BTC, Sequans shed 1,481 BTC, and Prenetics exited 502 BTC, a combined 7,359 BTC.

At Bitcoin’s May 31 price of $73,579, that reduction carried a face value of roughly $541 million, about 230 times the size of Strategy’s sale.

BitcoinTreasuries noted that its May recap used a methodology that incorporated backdated entries and specifically flagged Core Scientific’s 1,990 BTC reduction as one that would not have appeared under its previous method.

MARA’s larger reduction also traced back to a March disclosure, when the company sold 15,133 BTC between Mar. 4 and Mar. 25 to fund $1 billion in convertible-note repurchases, not a fresh May decision.

Sequans was unwinding a failed Bitcoin treasury strategy to redeem debt, and Prenetics had already authorized a full exit from Bitcoin to redirect capital toward its IM8 health business.

Each reduction had its own logic and timeline, and none reflected a shared judgment that May was a good time to sell.

The net picture from BitcoinTreasuries makes the dump thesis harder to sustain, as public Bitcoin treasury companies added or disclosed 51,000 BTC before the May reductions and 43,500 BTC net after the reductions.

Why Saylor’s sale landed differently

The market’s disproportionate reaction to 32 BTC reflects Strategy’s position as the symbol of corporate permanence in Bitcoin.

Since 2020, Michael Saylor has built that reputation into the company’s identity as an accumulator that never distributes and treats every dip as a buying opportunity. That positioning attracted a class of investors who used Strategy as a proxy for conviction that corporations would become structural Bitcoin buyers.

A single sale to meet a preferred-stock distribution obligation left the accumulation thesis intact mechanically, but it introduced a variable that Strategy has ongoing financial obligations, and Bitcoin is the only asset available to meet them.

The follow-on anxiety is rational, even if the immediate reaction was overblown, since Strategy carries debt and preferred stock obligations with fixed distributions.

If Bitcoin prices fall further, the spread between those obligations and the company’s ability to fund them through equity issuance or operating cash narrows.

The 32 BTC sale confirmed that the option to sell exists and that management will exercise it under sufficient financial stress.

Traders who built positions on the premise of a permanent buyer now have to price in an occasional seller, and that repricing does not require a large sale to begin.

The correction’s actual anatomy

Attributing Bitcoin’s more than 12% weekly decline solely to treasury selling misreads the flow data.
US-traded spot Bitcoin ETFs saw roughly $4.4 billion in outflows over the last 13 recorded trading days through June 3.

Those outflows dwarf Strategy’s $2.5 million sale and the combined $541 million in May treasury reductions by an order of magnitude.

Geopolitical tensions tied to Iran added a separate risk-off layer, and futures liquidations exceeding $90 million amplified whatever directional move was already underway.

Strategy’s disclosure entered that environment as a narrative accelerant, traders looking for a reason to reduce exposure found one, and the symbolic weight of Saylor selling gave the move a headline that stuck.

Standard Chartered’s Geoffrey Kendrick maintained a $100,000 year-end 2026 Bitcoin target after the decline, treating the drawdown as a positioning reset.

That framing holds as long as the ETF outflow cycle reverses and treasury-sector net accumulation continues, and gives way if Strategy or other debt-carrying treasury holders face sustained stress requiring liquidation at scale.

What the treasury model now has to prove

If the market absorbs that small tactical sales can fund obligations without ending the accumulation thesis, Strategy’s June 1 disclosure becomes a governance footnote.

Net treasury accumulation of 43,500 BTC in May, continued ETF inflows once the current outflow cycle exhausts itself, and Standard Chartered’s unchanged price target all support that reading.

Bitcoin stabilizes, Strategy’s premium to net asset value recovers, and the 32 BTC sale gets filed under balance-sheet housekeeping.

If investors reprice the treasury model instead, deciding that firms carrying debt and preferred obligations are conditional buyers, May becomes a template for repeated headline risk.

Every quarterly filing season, every preferred distribution date, every convertible-note maturity creates a window for another small sale that lands with outsized narrative force.

The price correction from that repricing would come from the erosion of the premium investors assigned to Strategy’s perpetual-accumulation posture.

Corporate Bitcoin treasuries built their market value partly on the promise of one-way buying, and the 32 BTC sale raised the question of how many times a permanent buyer can sell before the market stops treating it as permanent.

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