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Diagrams

Wallet MPC Topology

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Used in: §8.1 Wallet Architecture Audience: Holder, Backend Developer IA ID: D16

User device (Expo wallet) IDA platform Recovery custody MPC sign request partial signature aggregate used only on recovery Final Ed25519 / secp256k1 signature Key share 1 (secure enclave) Key share 2 (HSM-backed) Key share 3 (encrypted, social recovery)

Reading guide: A normal sign uses shares 1+2 (t-of-n = 2-of-3). Share 3 is dormant until recovery is invoked. No single party can reconstruct the key.