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Q-Chain provides quantum finality verification for prices/orders from other sources, NOT its own price feed. Changes: - Rename QChainSource to QChainVerifier (with backwards compat alias) - Remove Q-Chain from price aggregator (not a Source interface) - Q-Chain only used with -verify flag to verify finality - Update architecture diagram to show Q-Chain as verification layer Price Sources (6 total): - X-Chain (2.0): Native DEX orderbook - C-Chain (1.8): AMM pools - Zoo Chain (1.7): Zoo Labs DEX - A-Chain (1.5): Validator-attested network oracle - Pyth (1.2): External oracle - Chainlink (1.0): External oracle (reference) Q-Chain Verifier: - Post-quantum signatures (dilithium, sphincs+) - Cross-chain order inclusion proofs - Validator quorum consensus (3/4) - ~50ms finality latency