Why Stellar's Quantum Plan Is More Technical Than Any Blockchain Has Published




 The conversation about quantum computing and crypto usually stays at the surface. Quantum computers are coming, they will break encryption, blockchains need to prepare. That framing is accurate but it skips the part that actually matters to anyone running infrastructure or holding assets on a live network.

Stellar published its Quantum Preparedness Plan on June 9. The three-stage roadmap runs from 2026 through 2027 and targets full migration away from Ed25519 cryptography before quantum computers gain enough power to break it. Most coverage stopped there. What sits underneath that plan is a detailed technical argument about which post-quantum signature scheme to use, in what order, and why.

A public GitHub discussion opened by Stellar maintainer jayz22 in April laid it out. Three schemes are on the table: ML-DSA, SLH-DSA, and Falcon. Each carries different tradeoffs on signature size, verification speed, hardware support, and regulatory acceptance. ML-DSA is the most supported across cloud key management systems and national security frameworks. Falcon is the most compact, around 16 times the size of the current Ed25519 authenticator versus ML-DSA's 39 times. SLH-DSA is the conservative backup, relying only on hash security rather than lattice math, but it is too slow for daily transaction signing.

INRIA researchers showed in early 2026 that breaking the elliptic curve family that includes Stellar's Ed25519 now requires only 1,193 logical qubits, 44% fewer than prior estimates. NIST moved its danger window from 2030 to 2029. Google set the same internal deadline.

What Stellar's plan also addresses, and almost no coverage touched, is the dormant account problem. Forcing an Ed25519 cutoff would freeze accounts whose holders are unreachable. The foundation has said it will bring that decision to the community rather than decide it alone.

For a deeper look at the scheme-level debate, the regulatory jurisdiction breakdown, and what this means for enterprise wallets building on Stellar today, the full analysis is at CryptoNewsLive.org.

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