For Custodians & MPC Providers
Preserve Distributed Approval With Post-Quantum Security
Your clients bought distributed approval. They expect to keep it. EternaX's dual-gate model gives custodians post-quantum-safe distributed control that works with any NIST-approved signature scheme — today and when the next standard lands.
Why This Matters Now
Threshold ECDSA bundled two things into one object: distributed authorization and native signature production. The post-quantum transition breaks that bundle — hash-based signatures are not naturally threshold-signable, and no major MPC provider has disclosed a PQ-safe custody solution.
- 15 major institutional MPC providers, $10T+ in assets, zero PQ-safe custody disclosed
- Falling back to HSM centralization reclaims the single-point-of-compromise problem MPC solved
- Plain post-quantum multisig loses the custody programmability clients depend on: shares, refresh, policy binding, transcript roots
- Every new custody deployment on classical MPC is fresh migration debt
How It Works
Gate 1: Member Authentication
Each custody member signs an approval envelope with a PQ signature scheme (e.g. SLH-DSA). Every approval is individually attributable: who approved what, when.
Gate 2: Threshold Authorization
A separate threshold layer verifies that a quorum contributed valid authorization shares for the same operation. Signature-scheme-agnostic. Distributed control without distributed signing.
Funds move only when both gates pass. The authorization layer is independent of the signature scheme — swap to a future NIST standard without redesigning the custody protocol.
What You Get
Distributed Approval, Preserved
Withdrawals, mint/burn, rotation, and policy changes still require multiple independent approvals. No collapse to single-HSM control.
Future-Proof by Design
The authorization layer is independent of the signature scheme. When NIST approves the next standard, swap the authentication layer — the custody protocol stays the same.
Verifiable Audit Trail
Every operation produces receipts: who approved, quorum composition, policy binding, nonce consumption. Auditors can verify without holding custody material.
Key and Policy Rotation Built In
Key rotation, custody-set rotation, and policy changes are normal operations under dual-gate enforcement. Same quorum discipline as asset movement.
Target Workflows
Your clients bought distributed approval. Keep it.
Pressure-test the dual-gate workflow: approval UX, evidence retention, policy rotation, and minimum setup for regulated operations.
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