What are based ZK applications on Kaspa?

Based ZK applications are ZK rollups or state machines that derive their sequencing and security directly from Kaspa's base chain, rather than relying on a separate sequencer. A ZK rollup is a Layer 2 system that processes transactions off-chain but submits a cryptographic proof back to the main chain to guarantee correctness — no one has to trust the operator, because the math is verifiable on-chain. 'Based' means Kaspa itself controls the order of transactions, so no separate party can manipulate that ordering. For a beginner, this matters because applications built this way inherit Kaspa's own security and decentralization rather than introducing a new point of trust.