BlackRock, Coinbase, Strategy Back $15 Million Bitcoin Quantum Defense

Bitcoin relies on elliptic-curve cryptography to keep private keys secure, but a sufficiently powerful quantum computer could eventually derive keys from exposed public keys and put some holdings at risk. The issue matters because Bitcoin upgrades require broad agreement among developers, miners, node operators, wallet providers and custodians. The U.S. National Institute of Standards and Technology finalized its first post-quantum cryptography standards in 2024, adding urgency to preparations that could take years.

Galaxy Digital launched its Bitcoin Quantum Readiness Initiative on July 21, 2026, committing up to $5 million in grants for open-source developers and researchers. Funding will target quantum-resistant transaction proposals, post-quantum signature schemes, migration tools for wallets and custodians, and formal security audits. The program also includes published research and a Quantum Advisory Council whose members include Barry Sanders of the University of Calgary, Damien Bérubé, an MIT Sea Grant Knauss fellow, and Boston University professor Eran Tromer.

Bitcoin transactions use elliptic-curve digital signatures to protect assets. Once an address reveals its public key, a sufficiently powerful quantum computer could eventually derive the private key and steal the funds. The threat is not exploitable today, but the permanent public record of blockchain data means exchanges and long-term holders must plan ahead to migrate to quantum-secure addresses.

Coinbase’s independent advisory board on quantum computing and blockchain released a report on June 11, 2026, estimating that the public keys for about 7 million BTC have been exposed. About 1.7 million BTC are held in early P2PK addresses, while roughly 5 million BTC are exposed through address reuse and largely consist of active funds such as exchange cold wallets. Attackers can collect the data now and attempt to crack it later.

Bitcoin transactions rely on elliptic-curve digital signatures. A sufficiently powerful quantum computer could use Shor's algorithm to derive a private key from a public key, leaving older addresses whose keys have already been exposed at greatest risk. A February 2026 estimate put nearly 7 million BTC at risk, including about 1 million attributed to Satoshi Nakamoto, with a combined value of about $440 billion. The issue has implications for holders' property rights and consensus across the network.

On June 13, 2026, an independent quantum computing advisory board convened by Coinbase said quantum computers could not yet break Bitcoin but urged immediate planning for quantum-resistant signatures. It estimated that about 6.7 million BTC was at risk but did not endorse freezing or restricting older coins. A May 6 report from Project Eleven set 2033 as its baseline year for Q-Day, with 2030 as the earliest scenario.

Bitcoin and Ethereum rely on elliptic-curve digital signatures to secure transactions and asset ownership. If quantum computers become substantially larger and more stable, they could theoretically derive private keys. The U.S. Commerce Department’s support for the quantum industry therefore has implications beyond technological competition and is adding pressure on the crypto sector to accelerate its adoption of post-quantum cryptography.

As of July 20, 2026, the U.S. Commerce Department planned to invest more than $2 billion in nine quantum-computing companies to help scale the technology. The development has renewed concerns about the security of Bitcoin and Ethereum. Experts are calling for prompt planning of Post-Quantum Cryptography upgrades and closer coordination among governments, regulators and developer communities.

Bitcoin transactions use elliptic-curve digital signatures to secure assets. A quantum computer running Shor’s algorithm could potentially derive private keys from public keys, putting older wallets and transaction security at risk. Ethereum, by contrast, has planned a mechanism allowing accounts to adopt quantum-resistant signatures, bringing corporate crypto treasury strategies and onchain governance capabilities into focus.

Google Quantum AI and other institutions published research on March 30, 2026, estimating that fewer than 500,000 physical qubits could crack a key in about nine minutes. Citi warned on May 18 that the potential attack timeline had shortened. Bit Digital had already announced on July 7, 2025, that it would sell about 280 Bitcoin and, alongside a $172 million fundraising, increase its holdings to 100,603 Ethereum.

Bitcoin uses elliptic-curve cryptography to protect assets and communications, but sufficiently powerful quantum computers could eventually break its current encryption. Experts say the more immediate danger is a “harvest now, decrypt later” strategy, in which attackers intercept and store large volumes of encrypted communications today, then recover sensitive historical data once the technology matures. The threat extends beyond wallet private keys.

Security experts and an early-stage venture investor have recently warned that historical communications and infrastructure data across the Bitcoin ecosystem may already be targets for quantum attacks. Ethereum has begun work on a post-quantum migration, but as of this report, neither Bitcoin nor related companies had publicly committed to specific safeguards, disclosed investment amounts or set completion dates. The upgrade timetable and division of responsibility therefore remain unclear.

Once assets are spent from a Bitcoin address, its public key is exposed. A sufficiently powerful quantum computer could eventually derive the private key and steal the funds. Compared with Satoshi Nakamoto’s long-dormant coins, institutions including Coinbase and BlackRock frequently reuse addresses, creating broader exposure and making the migration to post-quantum cryptography a key asset-security concern.

A quantum-security session at the Bitcoin 2026 conference said institutional addresses could face greater risk than Satoshi-era coins. Participants also debated how to handle vulnerable assets during the transition, including freezing them outright, leaving holders to bear the risk, or using an Hourglass mechanism to limit the speed of transfers. Existing reports did not disclose the exact date of the session, the value of assets at risk or a final approach.

Bitcoin transactions rely on elliptic-curve digital signatures. A sufficiently powerful quantum computer running Shor’s algorithm could derive private keys from exposed public keys and steal assets. Replacing the signature mechanism would require network-wide consensus and asset migration, drawing attention to StarkWare’s upgrade-free approach as a fallback until longer-term changes such as BIP-360 are completed.

On April 9, 2026, StarkWare Chief Product Officer and BIP-360 co-author Avihu Levy published the QSB paper and open-source code. The system uses Bitcoin’s existing Script constraints and hash-based proofs to create quantum-resistant transactions without a soft fork or miner activation. Each transaction requires substantial offline GPU computation at an estimated cost of $75–$200, and the tool is currently intended for emergency recovery.

Quantum computers capable of breaking public-key cryptography could threaten Bitcoin signatures and asset ownership, making the technology a long-term market risk. Strategy, formerly MicroStrategy, co-founder and Executive Chairman Michael Saylor said banks, the internet and crypto assets all face the same pressure to upgrade, while Bitcoin could adopt quantum-resistant cryptography through updates to its nodes, wallets and protocol.

Saylor told Natalie Brunell’s “Coin Stories” on Feb. 23, 2026, that any quantum breakthrough posing a material threat was at least 10 years away. At a Mizuho event on April 8, he again said the risk was overstated and could be addressed through upgrades. He also said Bitcoin had likely bottomed at about $60,000 in early February; its price was around $71,200 when the report was published on April 9.

Quantum computers could theoretically derive private keys from public keys exposed on-chain, allowing attackers to forge signatures and steal assets. Cybersecurity organization Project Eleven estimates that about 7 million Bitcoin may face long-term exposure, worth roughly $470 billion at recent prices. Most wallets whose public keys have not been revealed are currently unaffected, however, meaning the risk does not extend across the entire network.

Galaxy Digital research head Alex Thorn said on March 19, 2026, that the quantum threat was real but did not yet pose an existential crisis for Bitcoin. Research analyst Will Owens added on March 20 that related proposals had increased markedly since late 2025. Developers are advancing quantum-resistant addresses, BIP 360 and phased upgrade plans, while investors should currently view the issue as a long-term technical challenge.