"The recent publication of Bitcoin Improvement Proposal 360 (BIP-360) officially adds quantum resistance to Bitcoin's long-term technical road map for the first time. While some headlines portray it as a dramatic shift, the reality is far more measured and incremental."
"For security, Bitcoin depends on cryptography, primarily the Elliptic Curve Digital Signature Algorithm (ECDSA) and Schnorr signatures introduced via Taproot. Regular computers cannot realistically derive a private key from a public key. However, a powerful quantum computer running Shor's algorithm could break elliptic curve discrete logarithms, exposing those keys."
"BIP-360 introduces Pay-to-Merkle-Root (P2MR), which removes Taproot's key path spending option and forces all spends through script paths to minimize elliptic curve exposure. Smart contract flexibility remains intact, as P2MR still supports multisig, timelocks and complex custody structures via Tapscript Merkle trees."
BIP-360 represents Bitcoin's first formal step toward quantum resistance, introducing Pay-to-Merkle-Root (P2MR) as an incremental rather than dramatic solution. Quantum computers threaten Bitcoin's elliptic curve cryptography (ECDSA and Schnorr signatures) through Shor's algorithm, but SHA-256 hashing remains relatively secure. The primary vulnerability lies in exposed public keys, not hashing functions. P2MR removes Taproot's key path spending option, forcing all transactions through script paths to minimize elliptic curve exposure. This approach maintains smart contract flexibility, supporting multisig, timelocks, and complex custody structures via Tapscript Merkle trees. The proposal does not yet achieve full post-quantum security but establishes a measured, long-term technical roadmap addressing an emerging threat.
Read at Cointelegraph
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