Nic Carter Warns Bitcoin Developers Lag on Quantum Resistance as Ethereum Advances Post-Quantum Roadmap

Crypto entrepreneur and Castle Island Ventures partner Nic Carter warned on March 26, 2026, that Bitcoin developers have their “head in the sand” regarding quantum resistance, arguing that Ethereum’s active post-quantum planning could give it a competitive advantage as the threat of cryptographically relevant quantum computers (CRQCs) approaches within the next decade.

Carter stated that elliptic curve cryptography (ECC)—the foundation of Bitcoin’s security—is “on the brink of obsolescence,” and that blockchain networks must bake in cryptographic mutability rather than hardcoding cryptography that cannot be updated. Ethereum developers have already established a post-quantum roadmap with a 2029 target as a “top strategic priority,” while Carter accused Bitcoin Core contributors of ignoring quantum-related proposals such as BIP-360.

The debate intensified as Google announced on March 25, 2026, that it is setting a 2029 deadline for its post-quantum cryptography migration, warning that quantum computers will “pose a significant threat” to current cryptographic standards, “specifically to encryption and digital signatures.”

Nic Carter’s Critique of Bitcoin’s Quantum Preparedness

Imminent Threat Assessment

Carter has previously warned that a CRQC capable of breaking Bitcoin’s encryption could emerge by 2035, citing rapid increases in quantum computing capacity, rising private investment, and government agency preparations for quantum-resistant encryption standards. In his latest remarks, he stated: “Elliptic curve cryptography is on the brink of obsolescence. Whether it’s 3 or 10 years; it’s over and we need to accept that.” He argued that there will need to be an “entire reimagining” of how these systems work, and that cryptography, currently hardcoded into networks, must become mutable.

Criticism of Bitcoin Core Development

Carter accused Bitcoin developers of having a “worst in class approach,” alleging they “deny, gaslight, gatekeep, bury heads in sand, say ‘the community will decide’ and then refuse to take feedback from the community when offered.” He previously claimed that Bitcoin Core developers have been ignoring quantum-related proposals such as BIP-360, which proposes a quantum-resistant address format.

Response from Bitcoin Developers

Ethan Heilman, a co-author of BIP-360, responded in February 2026 that Core contributors have been engaging with the Bitcoin improvement proposal and that BIP-360 has received “more comments than any other BIP in the history of BIPs.”

Ethereum’s Post-Quantum Advantage

Active Roadmap

Carter highlighted that Ethereum developers are already working on quantum resistance with a new security team and have published a detailed post-quantum roadmap with a 2029 implementation target, which the Ethereum Foundation has set as a “top strategic priority.” Ethereum co-founder Vitalik Buterin stated in late February 2026 that validator signatures, data storage, accounts, and proofs must change to prepare for quantum threats, proposing a comprehensive quantum resistance roadmap.

Competitive Implications

Carter argued that Ethereum’s proactive approach could lead to a divergence in valuation: “ETH people have already figured this out. Everyone else seems to be petrified in fear. Unless something changes quickly, ETHBTC will start to reflect the divergence in prioritization.”

Google’s Quantum Warning and Industry Context

2029 Migration Deadline

Google announced on March 25, 2026, that it is setting a 2029 deadline for its post-quantum cryptography migration. The search giant warned that quantum computers will “pose a significant threat” to current cryptographic standards, “specifically to encryption and digital signatures.”

Risk Assessment

ARK Invest stated in a March 11, 2026, paper that approximately one-third of all Bitcoin was at risk from the quantum threat, though it characterized the risk as “long-term.” Carter has argued that Bitcoin itself would be considered a “bug bounty” for quantum supremacy, with billions of dollars waiting to be snatched by the first country or entity to develop a CRQC.

Frequently Asked Questions

What is the quantum threat to Bitcoin?

Bitcoin’s security relies on elliptic curve cryptography (ECC), which quantum computers could potentially break. A cryptographically relevant quantum computer (CRQC) could derive private keys from public addresses, allowing attackers to steal funds. Experts estimate such a machine could emerge by 2035, though timelines vary.

How does Ethereum’s approach differ from Bitcoin’s?

Ethereum developers have established a post-quantum roadmap with a 2029 target as a “top strategic priority,” with active work on validator signatures, data storage, accounts, and proofs. Carter argues Bitcoin developers have been slower to engage with quantum-resistant proposals such as BIP-360, though proponents of the proposal dispute this characterization.

What is BIP-360?

BIP-360 is a Bitcoin improvement proposal that introduces a quantum-resistant address format. Co-author Ethan Heilman has stated that Core contributors have been engaging with the proposal and that it has received more comments than any other BIP in Bitcoin’s history.