zat.dev
atproto utils for zig
zat.dev
atproto
sdk
zig
docs: fix devlog 005 — focus on zat changes, not atproto-bench
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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devlog/005-three-way-verify.md
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devlog/005-three-way-verify.md
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go's MST walk is fastest (5.8ms vs zig's 45.5ms) because indigo's `LoadRepoFromCAR` builds the MST in memory during CAR parse. walking it is just pointer chasing. zig and rust decode MST nodes from raw CBOR on each visit.
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## the chart tool
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added a script (`scripts/verify_chart.py`) that parses `just verify` output and generates SVG charts — stacked horizontal bars with a dark theme. two variants: compute-only (the interesting comparison) and total (dominated by network). see the [atproto-bench README](https://tangled.sh/@zzstoatzz.io/atproto-bench) for the charts.
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## what changed in zat
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```sh
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just chart pfrazee.com # run verify + generate SVGs
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```
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the O(n) block lookup was the only code change — CAR blocks are now indexed in a `StringHashMap` instead of a flat slice. the rest of the verify pipeline (handle resolution, DID resolution, CAR parsing, signature verification, MST walk + rebuild) was already working from 0.2.0.
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## what's in this release
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also exported the `jwt` module directly (not just the `Jwt` type) so the verify tool can call `jwt.verifySecp256k1` without reaching into internals. and made CAR size limits configurable (`max_size`, `max_blocks` in `readWithOptions`) — pfrazee's 70 MB repo blows past the 2 MB default.
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- **go-verify**: full trust chain verification using indigo
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- **rust-verify**: full trust chain verification using RustCrypto + hand-rolled CAR/MST
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- **zig verify**: O(1) block lookup fix (HashMap instead of linear scan)
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- **scripts/verify_chart.py**: SVG chart generation from verify output
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- **justfile**: `just verify`, `just chart` recipes
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the three-way comparison and chart tooling live in [atproto-bench](https://tangled.sh/@zzstoatzz.io/atproto-bench).