The sharper concern involves roughly 1.7 million Bitcoin sitting in early P2PK addresses, where the corresponding private keys are either unknown or inaccessible.
Bitcoin News
A paper published by Google on March 30 suggested that a quantum computer could potentially break the cryptographic protections securing Bitcoin using far fewer resources than previously estimated, reigniting industry debate over how seriously and quickly the threat needs to be addressed.
Grayscale head of research Zach Pandl argued in a research note that the more pressing challenge is not technical but social, pointing to the Bitcoin community's track record of struggling to reach consensus on protocol changes. He described the risk of inaction as largely a coordination problem.
On the technical side, Pandl said Bitcoin carries lower quantum exposure than most other cryptocurrencies because of its UTXO model, proof-of-work consensus mechanism, and the absence of native smart contracts. Certain address types are also not considered quantum vulnerable under current assessments.
The sharper concern involves roughly 1.7 million Bitcoin sitting in early P2PK addresses, where the corresponding private keys are either unknown or inaccessible. That pool includes an estimated 1 million Bitcoin attributed to Satoshi Nakamoto, currently worth around $68 billion.
Three broad options exist for handling those dormant coins: burning them outright, limiting the rate at which they can be spent from vulnerable addresses to slow their potential release, or leaving the situation as it is. Pandl described all three as technically feasible.
"All are conceptually doable, but the challenge is reaching a decision, and the Bitcoin community has a history of contentious debates over protocol changes, including last year's dispute around image data stored in blocks," Pandl wrote. He was referring to the fracas that emerged in 2023 over Bitcoin Ordinals, a protocol allowing data such as images and text to be inscribed onto individual satoshis. Two years on, both sides in that dispute continue to hold opposing positions without resolution.
Pandl used the Ordinals conflict as an illustration of how long community disagreements can persist even without an active crisis, and warned that reaching a decision on quantum preparedness before the threat becomes urgent will require the same community to move faster than it has historically managed.
Other major networks are not waiting. Solana and the XRP Ledger are already experimenting with post-quantum cryptography, and the Ethereum Foundation published its own post-quantum roadmap in February.
Pandl concluded that no immediate security threat to public blockchains exists from quantum computers today, but said it is "time to get started." He advised investors not to panic while urging the ecosystem to accelerate its shift toward postquantum cryptographic standards.
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