BlockchainAdvanced#Privacy#Scaling
Zero-Knowledge Proofs (ZKP)
Z
Definition
A cryptographic proof that a defined statement or computation satisfies a protocol without disclosing the witness beyond what that protocol reveals. It is not, by itself, a privacy or performance guarantee for an application.
Source reviewed
- Ethereum.org: ZK-rollups opens in a new tab
Supports: Explains that ZK-rollups submit validity proofs for offchain execution and identifies data availability and sequencer design as separate considerations.
- Ethereum.org: Data availability opens in a new tab
Supports: Explains why availability of state data remains necessary for users to interact with and recover from a rollup.
Concept Diagram
Key Takeaways
1
A ZKP verifies a defined statement; its privacy properties depend on the circuit and public inputs
2
ZK-rollups use validity proofs for claimed state transitions, not a universal speed or cost promise
3
Data availability remains necessary for users to inspect state and recover funds or transactions
4
Review the protocol, verifier, public data, and exit design instead of inferring privacy from the term ZK
Practical Example
Before using a ZK-rollup, a user checks the protocol documentation for the exact state transition proved, the data published for reconstruction, the withdrawal path if a sequencer fails, and which transaction fields remain public. A validity proof alone does not answer those questions.
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Related Terms
AI
TEE (Trusted Execution Environment)A hardware-backed isolated execution environment that can protect specified code and data under an explicit platform threat model. Its assurance depends on the implementation, attestation policy, measured software, key release, configuration, and remaining hardware and software attack surface.
Blockchain
Proof of PersonhoodA family of mechanisms that attempts to limit duplicate participation in a defined system. It can provide evidence under stated assumptions; it does not prove unique human identity, eliminate Sybil attacks, or guarantee privacy, inclusion, or fair distribution.
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Layer 2 (L2)A protocol layer that executes transactions outside an L1 while using that L1 for some combination of data availability, proofs, dispute resolution, or settlement. Fees, finality, bridges, and withdrawal paths depend on the specific L2 design.
Blockchain
ShardingA family of scaling designs that divide data or execution work across subsets of a network; the exact meaning depends on the protocol.
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