Approximately 6.7 million to 7 million BTC are currently stored in addresses whose public keys are exposed on the blockchain ledger. Fireblocks VP of Research Michael Gutkin identified this vulnerability as a primary entry point for quantum computing attacks capable of cracking cryptographic systems in the future.
Gutkin explained that address formats and transaction history are the two primary factors determining a wallet’s risk level. The most vulnerable category consists of legacy addresses from the early Satoshi Nakamoto era, particularly those utilizing the Pay-to-Public-Key (P2PK) standard. This first-generation format directly reveals public keys on the network upon wallet creation, leaving funds without an extra layer of defense against quantum decryption.
Why Newer Formats Remain Vulnerable
Network upgrades later introduced address standards with stronger privacy mechanisms. Advanced formats such as P2PKH and P2WPKH were specifically engineered to conceal public keys from public view. The network keeps the key hidden until the user broadcasts an outgoing transaction for the first time.
However, user behavior can undermine these built-in privacy protections. Gutkin stressed that P2PKH and P2WPKH addresses become high-risk again when owners reuse the same address to receive new incoming transactions. Once a wallet executes an outgoing transfer, its public key becomes permanently visible to all computational nodes on the network. If funds remain in that previously used address, the remaining balance immediately loses its protection against quantum decryption.
Taproot Solutions and UTXO Management
In response to the substantial volume of assets exposed over the long term, Bitcoin developers are actively designing technical mitigations. The community is currently discussing the BIP 360 proposal, which introduces a pay-to-Merkle-root structure. This proposal aims to disable key-path spending within Taproot architecture to eliminate quantum exploit vectors.
On the user side, Fireblocks advised asset managers against attempting to move all their holdings at once. A coordinated mass migration of millions of Bitcoins risks congesting network traffic and triggering severe fee spikes. Instead of panic-moving funds, Fireblocks recommends institutions establish routine address rotation practices. A consistent rotation schedule combined with proper UTXO management offers the most secure path to protect assets against future quantum threats without disrupting daily operations.
Reported by crypto.news.
Also read: What Is Bitcoin Halving?
Disclaimer: This article is for informational and educational purposes only, not financial advice. Cryptocurrency assets are highly volatile and carry significant risk. Always do your own research (DYOR) and never invest more than you can afford to lose.
