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diff --git a/crypto/src/lib.rs b/crypto/src/lib.rs
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+// Placeholder crypto module for OnionCoin
+// Production implementation would include:
+// - Ring signatures (Monero-style)
+// - Bulletproofs for confidential transactions
+// - Stealth address generation
+// - Key derivation (HD wallets)
+
+pub mod keys;
+
+pub use keys::{KeyPair, PublicKey, SecretKey};