Stellar draws up its quantum armor as the clock ticks on $711B in sleepy Bitcoin wallets ⏳

The Stellar Development Foundation on Tuesday released a three-stage Quantum Preparedness Plan aimed at shielding its network from cryptographic risk as quantum computing advances. The foundation said the roadmap addresses two threats: forged validator signatures that could undermine consensus, and the longer-term ability of quantum machines to derive private keys from public ones, which would enable account takeover. It identified the latter as the harder problem and the primary focus of the plan.

Stellar's account model separates account identity from signing keys, a structural feature the foundation said lets users rotate in quantum-safe algorithms without changing their public address or moving balances, unlike Bitcoin and Ethereum. The proposed rollout begins in 2026 with post-quantum signature verification added to Stellar's smart contract layer, enabling enterprise wallets to begin migrating. In 2027, a protocol upgrade would let every Stellar account attach a quantum-safe signer while keeping its existing address. A final stage would deprecate the current cryptography, with the timing tied to quantum computing progress and community readiness. The foundation flagged dormant accounts as an open issue, noting that any hard cutoff would freeze unreachable funds and require community consensus rather than a top-down decision.

The release lands against a sharpening quantum timeline. The National Institute of Standards and Technology, which had previously placed the danger zone at 2030 and beyond, has updated its guidance to 2029, and Google has set 2029 as its internal deadline for post-quantum readiness. Researchers have warned that public, permanent ledgers face a specific risk profile: encrypted material harvested today could be retroactively decrypted once fault-tolerant quantum hardware arrives, exposing more than $711 billion in vulnerable $BTC wallets. While quantum machines cannot break Bitcoin's cryptography today, multiple March 2026 research papers suggest the gap to that capability is narrowing faster than earlier projections assumed. The foundation did not name a specific Q-Day estimate in its announcement.