TLDR
- Blockchain analytics firm Glassnode reveals 6.04 million BTC—representing 30.2% of total supply—faces quantum computing threats
- Approximately $469 billion worth of Bitcoin has exposed public keys on the blockchain
- Major exchanges including Binance and Bitfinex display 85% and 100% quantum vulnerability in their holdings
- AmericanFortress has secured $8 million in funding to build a quantum-resistant solution leveraging zero-knowledge proof technology
- The proposed protocol could safeguard Satoshi Nakamoto’s estimated 1.1 million BTC plus nearly 5 million additional dormant coins without requiring large-scale transfers
A striking new analysis from Glassnode, a leading blockchain analytics platform, indicates that approximately one-third of all circulating Bitcoin faces potential compromise if quantum computing technology advances to the level required to break existing cryptographic protections.
Through comprehensive blockchain examination, Glassnode identified which coins have publicly exposed cryptographic keys. The research uncovered 6.04 million BTC—valued at more than $469 billion—sitting in a quantum-vulnerable state. The analysis shows 13.99 million BTC remains protected with no public key disclosure.
Understanding the Security Flaw
Bitcoin‘s cryptographic foundation depends on the pairing of private keys with corresponding public keys. In typical circumstances, public keys remain hidden from the blockchain. However, once exposed through outgoing transactions or repeated address usage, an adequately powerful quantum machine could deploy Shor’s algorithm to calculate the private key and access the funds.
Glassnode categorizes the vulnerable supply into two distinct segments. The first, labeled structural exposure, encompasses 1.92 million BTC, accounting for 9.6% of total supply. This category includes early-era “pay-to-public-key” transactions associated with Bitcoin creator Satoshi Nakamoto, outdated multisignature configurations, and Taproot-based outputs.
The second segment, operational exposure, represents the larger threat at 4.12 million BTC, or 20.6% of circulating supply. These holdings became susceptible through repeated address utilization, where multiple transactions from identical addresses ultimately reveal the public key.
Cryptocurrency exchanges contribute significantly to this vulnerability profile. Approximately 1.66 million BTC within the operational exposure category belongs to exchange platforms. Coinbase demonstrates just 5% exposure across its identified reserves. By contrast, Binance and Bitfinex register 85% and 100% vulnerability respectively. Glassnode emphasized these figures reflect architectural custody decisions rather than financial stability concerns.
Government-held Bitcoin reserves showed stronger security postures. The United States, United Kingdom, and El Salvador all registered zero quantum vulnerability.
A Proposed Fix
Technology startup AmericanFortress believes it has engineered a workable remedy. The firm, supported by $8 million in seed capital, has created a patent-pending quantum-resistant signature system built on zero-knowledge proof technology.
The proposed framework would eliminate the need for widespread asset migrations or alternative blockchain creation. Instead, it employs a backward-compatible soft fork mechanism to freeze and secure inactive wallets—including Satoshi-era addresses that cannot receive automatic upgrades.
“Our quantum-resistant protocol would automatically freeze and protect those funds until governance decides what to do with them after Q-day,” said CEO Michal Pospieszalski.
The solution extends beyond Bitcoin to cover Ethereum, Solana, and Tron networks. For active participants, the upgrade process requires approximately 50 milliseconds through a wallet notification. The company estimates implementation costs equivalent to a single rollup transaction.
AmericanFortress asserts that over $600 billion in cryptocurrency assets remain in vulnerable positions, including every Solana address. The company plans to release its Bitcoin-specific cryptographic methodology for community review within weeks, with a formal unveiling scheduled for June 2 in Paris.
Meanwhile, Bitcoin’s development community continues evaluating BIP-360, a technical proposal for implementing quantum-resistant transaction structures. Current projections for “Q-Day”—the anticipated arrival of quantum computers capable of breaking Bitcoin’s encryption—span from 2030 to 2032. The United States government recently committed more than $2 billion toward quantum computing venture investments.
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