Key Highlights
- Blockchain analytics from Glassnode indicates 6.04 million BTC — representing 30.2% of total supply — faces quantum computing threats
- Bitcoin valued at more than $469 billion has publicly exposed cryptographic keys stored on-chain
- Major exchanges including Binance and Bitfinex demonstrate 85% and 100% quantum vulnerability levels
- AmericanFortress secured $8 million in funding to build a quantum-resistant solution leveraging zero-knowledge proof technology
- The proposed solution could safeguard Satoshi Nakamoto’s estimated 1.1 million BTC plus nearly 5 million additional inactive coins without requiring mass wallet migrations
Almost 30% of the entire Bitcoin supply currently circulating faces potential theft risks should quantum computing technology advance to levels capable of breaking existing cryptographic protections, new data from Glassnode reveals.
The blockchain analytics platform conducted comprehensive chain analysis to identify which coins have publicly visible cryptographic keys. Their findings show 6.04 million BTC — representing a value exceeding $469 billion — sits vulnerable to quantum threats. Meanwhile, the remaining 13.99 million BTC maintains secure public key privacy.
Understanding the Security Gap
Bitcoin‘s security architecture depends on the pairing of private keys with corresponding public keys. In standard operations, public keys remain hidden from blockchain visibility. However, once exposed through transaction activity or repeated address usage, advanced quantum computers could deploy Shor’s algorithm to calculate the private key in reverse and access the funds.
Glassnode categorizes the at-risk supply into two distinct classifications. Structural exposure accounts for 1.92 million BTC, equaling 9.6% of total supply. This category encompasses early-generation “pay-to-public-key” transactions associated with Bitcoin creator Satoshi Nakamoto, outdated multisignature configurations, and Taproot-based outputs.
Operational exposure represents the more significant threat at 4.12 million BTC, comprising 20.6% of circulating supply. These holdings became exposed through repeated address usage, where multiple transactions from identical addresses ultimately reveal the public key to the network.
Cryptocurrency exchanges represent a substantial portion of this vulnerability. Approximately 1.66 million BTC within the operational exposure category connects to exchange wallets. Coinbase demonstrates minimal exposure at just 5% among its tracked holdings. By contrast, Binance and Bitfinex show exposure rates of 85% and 100% respectively. Glassnode emphasized these figures reflect technical custody architecture rather than financial stability concerns.
Government-held Bitcoin reserves demonstrated stronger security profiles. National holdings for the United States, United Kingdom, and El Salvador all register zero quantum exposure.
An Innovative Solution Emerges
AmericanFortress believes it has engineered an answer. The blockchain startup, supported by an $8 million seed funding round, has created a proprietary post-quantum signature framework built on zero-knowledge proof cryptography.
The technology eliminates requirements for wholesale fund transfers or new blockchain infrastructures. Instead, it implements a backward-compatible soft fork mechanism to freeze and secure inactive wallets — including legacy Satoshi-era addresses that cannot undergo automatic security 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 security upgrade supports Bitcoin, Ethereum, Solana, and Tron networks. For wallets with active management, the upgrade process completes in approximately 50 milliseconds through a simple wallet notification. The company estimates transaction costs comparable to a single rollup operation.
AmericanFortress calculates that more than $600 billion in cryptocurrency assets remain in vulnerable conditions, with 100% of Solana wallet addresses exposed. The firm’s Bitcoin-specific cryptographic protocols are scheduled for public release within coming weeks, preceding a formal unveiling on June 2 in Paris.
Meanwhile, Bitcoin’s development community continues evaluating BIP-360, a technical proposal introducing quantum-resistant transaction structures. Projections for “Q-Day” — the moment quantum computing reaches sufficient power to compromise Bitcoin’s encryption — typically fall between 2030 and 2032. The United States government recently committed over $2 billion in investments toward quantum computing innovation this week.
