More than 6 million Bitcoin currently sit behind public keys that are already visible on-chain, highlighting the scale of digital assets potentially exposed to security threats if rapid advancements in artificial intelligence or quantum computing ultimately undermine wallet cryptography.
According to the latest figures shared by Glassnode co-founder Rafael Schultze-Kraft, these exposed coins account for approximately 31.2% of the entire circulating Bitcoin supply. This percentage represents an increase of roughly 5 to 6 percentage points above the cyclical low point reached back in 2023, signaling a concerning upward trajectory in public-key exposure across the broader network ecosystem.
The newly released data indicates that the quantum-exposed supply has expanded by 222,000 BTC—valued at roughly $18.2 billion based on current market pricing—since the analytics firm published its comprehensive report in May. In stark contrast, the total circulating supply of Bitcoin grew by a mere 64,000 BTC over the exact same timeframe, underscoring that the accumulation of exposed coins is outpacing the creation of new supply by a wide margin.
Cryptocurrency exchanges have played a substantial role in this shifting landscape, accounting for 123,000 BTC of the recent increase. Centralized trading platforms now collectively hold 1.79 million BTC behind visible public keys, though the exposure levels vary drastically from one institution to another.
A closer examination of individual entity disclosures reveals a wide spectrum of operational and cryptographic practices. Coinbase, for instance, maintains an exposed share of roughly 10% across its holdings. Meanwhile, Binance registers a significantly higher proportion, with approximately 83% of its tracked balances sitting behind exposed public keys.
Institutional custodians and alternative financial platforms present an equally diverse picture. Fidelity holds approximately 375,000 BTC, with a remarkably low exposure rate of just 2%. On the other end of the spectrum, Grayscale’s exposed share stands at 49%, while consumer-facing financial apps like Revolut and Robinhood register exposed proportions of 99% and 100%, respectively. Interestingly, sovereign holdings managed by the governments of the United States, the United Kingdom, and El Salvador show zero exposure under Glassnode’s specific analytical methodology.
Public keys typically become visible on-chain through common network practices, most notably address reuse, where a user receives funds multiple times through the same public address. Additionally, public keys can appear directly within certain legacy and advanced Bitcoin output types, such as early pay-to-public-key (P2PK) scripts and modern Taproot implementations. If a sufficiently powerful quantum computer were developed, or if a groundbreaking mathematical shortcut were discovered, an adversarial actor could theoretically leverage these visible public keys to mathematically derive the corresponding private keys, granting them unauthorized access to the underlying funds.
This data release arrives amid growing anxiety across the digital asset sector regarding the unprecedented acceleration of artificial intelligence capabilities. Ethereum researcher Justin Drake recently issued a prominent industry warning, urging crypto developers, institutions, and long-term holders alike to prepare for a potential "bunker mode" mentality. Drake argued that advanced artificial intelligence models could potentially accelerate the timeline for cryptographic threats, theorizing that sophisticated machine learning systems might uncover vulnerabilities or mathematical shortcuts to breaking wallet cryptography in a matter of months rather than decades—potentially materializing long before fault-tolerant quantum computers become a commercial reality.
Global Crypto Markets
Global Crypto Markets
Global Crypto Markets
