Bitcoin Developers Merge Quantum-Resistant Proposal

Why it matters

- The proposal, co-authored by developers Hunter Beast, Ethan Heilman, and Isabel Foxen Duke, introduces a new transaction output type called Pay-to-Merkle-Root (P2MR). This method removes the "key-path spend" option available in Taproot addresses, which is the primary element vulnerable to quantum attacks. - The core threat comes from Shor's Algorithm, which, if run on a powerful enough quantum computer, could break the Elliptic Curve Digital Signature Algorithm (ECDSA) that secures Bitcoin wallets by deriving a private key from a public key. - While BIP360 hardens defenses, it is considered a foundational first step; future upgrades are expected to introduce new post-quantum signature schemes, with potential candidates including ML-DSA (Dilithium) and SLH-DSA (SPHINCS+). - The most susceptible addresses are older types like Pay-to-Public-Key (P2PK), where the public key is permanently exposed, and reused Pay-to-Public-Key-Hash (P2PKH) addresses. Estimates suggest around 25% of all Bitcoin in circulation is held in addresses that are vulnerable to quantum attacks. - Merging a Bitcoin Improvement Proposal (BIP) into the project's official GitHub repository is a formal documentation step for community review and does not mean the upgrade has been activated on the network. - Timelines for a quantum threat vary widely among experts; while some researchers forecast a risk emerging between 2026 and 2028, others like Blockstream's CEO Adam Back view the threat as decades away. - Major tech firms are actively developing the necessary technology, with IBM publicly stating its goal to build a large-scale, fault-tolerant quantum computer by 2029. - The U.S. government is also preparing for this shift, with a mandate to phase out the use of ECDSA cryptography in federal systems entirely by 2035.

Key numbers

• Bitcoin developers have merged BIP360, a proposal designed to address future vulnerabilities from quantum computing.
• The upgrade comes as Bitcoin's price recently fell below $69,000 amid broader market volatility.
• - The proposal, co-authored by developers Hunter Beast, Ethan Heilman, and Isabel Foxen Duke, introduces a new transaction output type called Pay-to-Merkle-Root (P2MR).
• While BIP360 hardens defenses, it is considered a foundational first step; future upgrades are expected to introduce new post-quantum signature schemes, with potential candidates including ML-DSA (Dilithium) and SLH-DSA (SPHINCS+).

What happens next

• The core threat comes from Shor's Algorithm, which, if run on a powerful enough quantum computer, could break the Elliptic Curve Digital Signature Algorithm (ECDSA) that secures Bitcoin wallets by deriving a private key from a public key.
• While BIP360 hardens defenses, it is considered a foundational first step; future upgrades are expected to introduce new post-quantum signature schemes, with potential candidates including ML-DSA (Dilithium) and SLH-DSA (SPHINCS+).
• The move is a proactive security measure, as fault-tolerant quantum computers are predicted to emerge within the next five to seven years.

Sources

• have merged
• The proposal, co-authored
• This method removes the
• Estimates suggest around
• Merging a Bitcoin Improvement
• Timelines for a quantum
• Major tech firms are

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