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zkAPI, built by the Open Anonymity Project with the Ethereum Foundation, lets users deposit credits into an Ethereum vault contract once and then authorize bounded, metered API usage via zero-knowledge proofs instead of an API key tied to identity. The scheme uses Groth16 proofs over BN254, Poseidon-hashed note commitments in a 32-level Merkle tree, and one-way nullifiers to prevent double-spend while keeping spends unlinkable to deposits; a client mints short-lived, capped API keys locally and the server settles against the private balance via signed usage receipts. The post also candidly documents the system's limits: it doesn't anonymize network metadata/IP (mitigated by Tor) and doesn't prevent re-linking via prompt-content fingerprinting across sessions.
zkAPIEthereumOpenAI+3
Open Anonymity ProjectDavide CrapisVitalik Buterin+1
The Ethereum Foundation Protocol cluster lays out its security-driven roadmap through 2029, centered on making Ethereum L1 quantum-resistant across execution, consensus, and data layers by December 2029 (planning for Q-day as early as 2030). It details the fork sequence delivering a minimum-viable post-quantum milestone, cryptographic agility via native account abstraction (Frame transactions, EIP-8141), retirement of vulnerable BLS withdrawal credentials (EIP-8365), and censorship-resistance and privacy work via FOCIL (EIP-7805), EIP-8369, EIP-8250 and EIP-8272.
blog.ethereum.orgarticle