Grayscale’s head of research says the biggest hurdle in addressing the quantum-computing threat to Bitcoin is social — getting the community to agree on a solution — not purely technical limitations.
A March 30 paper from Google reignited discussion by suggesting quantum machines might break the cryptography protecting Bitcoin with fewer resources than previously estimated. Zach Pandl of Grayscale responded that, on balance, Bitcoin is technically less exposed than many other cryptocurrencies. He pointed to Bitcoin’s UTXO model, proof-of-work consensus, the absence of native smart contracts, and the fact that some address types are not vulnerable as factors that reduce its immediate technical risk.
Pandl argued the harder question is what to do about coins associated with lost or inaccessible private keys — chiefly roughly 1.7 million BTC tied to early P2PK addresses, including about 1 million BTC speculatively linked to Satoshi. The community faces three broad options: permanently burn those coins, deliberately constrain any future spending from vulnerable addresses (for example by limiting the rate of releases), or do nothing. All three approaches are technically feasible; the sticking point is securing broad social consensus.
Reaching agreement is difficult in Bitcoin’s governance model, Pandl noted, citing the network’s history of intense debates over protocol changes — for instance, the heated 2023 arguments around Ordinals and blockspace usage.
Pandl emphasized there is no immediate, practical security breach from quantum computers today, but he urged proactive planning. Blockchains should begin integrating post-quantum cryptographic measures now to be ready for future advances. Some projects are already experimenting: Solana and the XRP Ledger are testing post-quantum solutions, and the Ethereum Foundation published a post-quantum roadmap in February.
For investors, Pandl’s guidance was steady: don’t panic, but accelerate preparations for a post-quantum future so systems and governance can adapt in time.
About 1.7 million BTC is considered vulnerable to the quantum threat. Source: Grayscale.