InterNull: Achieving Cross-Chain Transaction Privacy Through ECDSA One-Time Signatures
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We present InterNull, a blockchain privacy protocol that achieves transaction unlinkability through Elliptic Curve Digital Signature Algorithm (ECDSA) one-time signatures (OTS). Unlike immutable zero-knowledge mixers that prevent regulatory compliance, InterNull introduces a Federated Privacy Model. While transac- tions remain cryptographically unlinkable to on-chain observers, the Distributed Key Generation (DKG) committee retains a threshold capability to reconstruct transaction graphs. This enables a selective de- anonymization mechanism where a quorum of nodes ( -of- t n ) can cooperate to identify illicit funds without compromising the privacy of legitimate users. The protocol enables multi-chain privacy via deferred, chain-specific key allocation and fixed-denomination multi-key splitting. We analyze security under a bounded exposure window defined by blockchain slot la- tency ( tslot ≪ any practical ECDLP break), ensuring forward secrecy against future quantum adversaries. Threshold DKG pre-computes Merkle trees of withdrawal public keys, yielding fast withdrawals (~85% low- er gas than zk-SNARK mixers). Deployments on Ethereum, BNB Chain, Base, and Solana validate the proto- col's performance and its unique position as a bridge between DeFi privacy and Anti-Money Laundering (AML) compliance.
