Umbra SDK skill

Quick-reference for building privacy features on Solana with Umbra. Full reference docs live at https://sdk.umbraprivacy.com/.

Semantic flow

register  (1× per wallet, idempotent — derives master seed deterministically)
   │
   ├─ deposit  (ATA → ETA, MPC) ────────────┐ if callback drops →
   ├─ withdraw (ETA → ATA, MPC) ────────────┤   getStagedSplRecovererFunction
   ├─ convert  (MXE-only → Shared)           │   getStagedSolRecovererFunction
   └─ create UTXO                            │   (Pitfalls §6)
        4 variants: {ATA,ETA} × {self,receiver}-claimable
            │   if create fails → re-run (closeProofAccount auto-recovers)
            ▼
       scan (indexer, cursor — UNTRUSTED, verify every commitment + proof)
            │