sp1-zorch
A lean SP1 prover built on zorch's
scheme-agnostic SNARK building blocks. zorch provides the reusable pieces
(hashing, Merkle commitment, sumcheck, fold, …); sp1-zorch adds only the
SP1-specific glue on top — domain separator, verify codes, heap proof layout,
and the FFI byte-match against the SP1 reference prover.
frx ──▶ zorch (scheme-/zkVM-agnostic blocks) ──▶ sp1-zorch (SP1 glue)
Status
The full SP1 shard proving scheme runs on zorch blocks: a ProveChain of
trace commit → LogUp-GKR → zerocheck → jagged PCS, byte-matching SP1's reference
prover end to end (its sp1_verify_shard accepts the assembled proof). See
docs/architecture.md.
Installation
Python 3.11 on Linux x86_64 only.
CPU
pip install sp1-zorch
GPU (CUDA 12)
pip install sp1-zorch 'frx[cuda12]' \
--extra-index-url https://fractalyze.github.io/pypi/simple/
The extra index carries the CUDA plugin wheels, which are too large for PyPI's per-file limit. It is not needed for the CPU tier.
Verify
python -c "import frx, sp1_zorch; print(frx.devices()); print(sp1_zorch.__version__)"
[CpuDevice(id=0)] means the CPU tier; a CUDA install prints the GPU devices.
Development
sp1-zorch is pure Python on frx (Field, Ring Accelerated), run
against the Fractalyze XLA GPU plugin, built with Bazel (bzlmod). It consumes
zorch as a Bazel module, pinned in MODULE.bazel via
git_override for reproducible builds.
python3.11 -m venv .venv && . .venv/bin/activate
pip install -r requirements.in \
--extra-index-url https://fractalyze.github.io/pypi/simple/
Dev against a local zorch checkout instead of the pinned commit — create
.bazelrc.user (gitignored):
common --override_module=zorch=/abs/path/to/your/zorch/checkout
Run the tests (CPU is the default for correctness; the FFI byte-match against the SP1 reference needs a CUDA GPU):
bazel test //...
Documentation
See docs/ — the architecture
(the shard proof as a ProveChain of Stages, each running inner Rounds, threaded
by a Bridge, plus the SP1 dump vocabulary), the
development guide (environment, testing, and the
per-stage SP1 baseline), and the conventions.
License
Licensed under the Apache License, Version 2.0 (see LICENSE).
1 maintainer
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