chain · quantum risk
Is Stellar (XLM) Quantum Proof?
Verdict
Stellar is not quantum-proof. Ed25519 account signatures are classical; multi-sig and anchors improve operations, not PQC assumptions.
Overview
Stellar is an account-based payments network using Ed25519 signatures for transaction authorization. It is optimized for issuance and remittance-style flows, not for being a NIST PQC showcase by default.
Enterprises on Stellar should inventory distribution accounts, multi-sig thresholds, custody providers, and any cross-chain bridges—same structural diligence as other account ledgers.
Cross-read Solana’s Ed25519 spoke for algorithm literacy; Stellar’s product surface differs but the quantum math category overlaps.
Cryptographic profile
- Signatures: Ed25519 (Stellar accounts / transactions)
- Hash: Protocol hashing per Stellar stack
- Public-key exposure: Accounts are public key identities; multi-sig thresholds common in payments orgs.
What breaks
- Classical signatures authorizing XLM value movement under Shor-class adversaries once public keys are known
- Custodial hot wallets and exchange operational keys
- Bridges or wrapped representations with concentrated signers (if used)
Mitigations
- Inventory every key that can move XLM (self-custody, exchange, multisig)
- Prefer multiparty / hardware policies for treasuries
- Document bridges and wrapped asset paths
- Track ecosystem PQC research; do not assume branding equals deployment
- Use /assessment and chain comparison hubs on this site for program framing
FAQ
Is Ed25519 quantum-safe on Stellar?
No. Ed25519 is classical. See /is-quantum-proof/solana-ed25519 for algorithm framing.
Do anchors change quantum risk?
Anchors change counterparty and operational risk. They do not convert classical signatures into PQC.
Key concepts (technical dictionary)
Terms used on this page — open a definition: