QBit SmartChain: A ZK-Native Post-Quantum Blockchain Protocol

Abstract

QBit SmartChain is a ZK-native Layer 1 blockchain protocol. It replaces direct signature gossip with STARK proof aggregation, cutting validator bandwidth by ~27× while hitting 30,000 TPS and ~3s consensus finality at 120-bitpost-quantum security. The protocol also supports QChains, sovereign application-specific blockchains that share QBit's security and finality through bridgeless Merkle proof cross-chain messaging.

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