proof-aware-crypto-tooling-agent

pacta is a local CLI prototype for interpreting formal-verification evidence in cryptographic tooling. It is not a trading bot, does not move funds, and does not make financial decisions.

The immediate corpus is the saymrwulf/*-verified family of repositories. The shipped Lean files are treated as the verification artifact. This project intentionally does not run Charon, Aeneas, extraction, or Rust-to-Lean regeneration.

Purpose

An autonomous economic agent needs to answer a narrow question before trusting infrastructure:

Does this theorem cover the exact code path that will protect my funds?

pacta helps answer that by replaying pure Lean checks where possible, auditing axioms and proof hygiene, generating machine-readable claim cards, and assigning residual-risk classifications with explicit exclusions.

macOS / Apple Silicon

The prototype is written for Python 3.11+ and macOS on Apple Silicon. It does not assume GNU coreutils, Linux free, Linux taskset, GNU timeout, Docker, Nix, or x86_64.

Lean tooling is detected with shutil.which("lean") and shutil.which("lake"). If neither is available, pacta reports clear diagnostics and still supports offline claim-card generation and static hygiene scans.

Install

python3 -m venv .venv
. .venv/bin/activate
python -m pip install -e ".[dev]"

PyYAML is optional. Without it, pacta can still read the included simple YAML examples and JSON-compatible .yaml files.

Commands

python -m pacta --help
pacta scan --config examples/repos.yaml
pacta doctor --config examples/repos.yaml --repo-name dalek-ed25519-verified
pacta claims --config examples/repos.yaml --repo-name dalek-ed25519-verified --offline-fixture --out claims.yaml
pacta audit --repo ./repos/dalek-ed25519-verified
pacta lean-check --repo ./repos/dalek-ed25519-verified
pacta report --claims claims.yaml --out report.md
pacta score --claims claims.yaml
pacta agent --config examples/repos.yaml --repo-name dalek-ed25519-verified --offline-fixture --action build-library
pacta agent --config examples/repos.yaml --repo-name dalek-ed25519-verified --clone --run-axioms --action build-library --artifact-dir artifacts-live
pacta agent --claims claims.yaml --action build-wallet-demo
pacta agent --config examples/repos.yaml --repo-name dalek-ed25519-verified --attestation examples/dalek-ed25519.attestation.yaml --trust-attestation-provider example-proof-checker.invalid --action build-library

Consequence Engine

pacta agent turns evaluation into an operational consequence.

• build-library requires R3 by default. It builds a small Rust proof-gated component capsule under artifacts/. The capsule embeds the claim card and exposes whether downstream automation may use the component for lower-layer cryptographic code only.
• build-wallet-demo requires R4. An R3 Ed25519 arithmetic claim will refuse this action and write a machine-readable denial artifact instead of building a wallet.

This is intentional. Arithmetic proof evidence can authorize a constrained lower-layer library decision, but it must not contaminate wallet, transaction, custody, or trading-agent risk scoring.

In live mode, --clone --run-axioms downloads the configured repository, replays the local Lean checks, runs the axiom audit, writes claims.yaml and report.md, and only builds the capsule if the resulting score satisfies the policy threshold. Failed replay is a hard consequence: no artifact is built.

Verifier Bootstrap

Some verified repositories rely on a pinned Aeneas Lean project, usually exposed by an environment script such as ~/aeneas-toolchain/env.sh. pacta can use that environment without running extraction:

pacta doctor --config examples/repos.yaml --repo-name dalek-ed25519-verified
pacta agent --config examples/repos.yaml --repo-name dalek-ed25519-verified --clone --run-axioms --action build-library

The configured defaults are:

• env_script: ~/aeneas-toolchain/env.sh
• lean_project_dir: $AENEAS_HOME/backends/lean

If those are missing, the result is R0 for local replay because this machine lacks verifier capability. That is different from saying the theorem is false. It means the agent cannot trust the repository from local machine-checked evidence yet.

Third-Party Attestation

For agents that should not build the full Lean/Aeneas environment locally, pacta also supports an attestation lane. A specialized proof-checking service can replay the proofs in its own controlled environment and publish a certificate describing:

• repository URL and commit,
• theorem/certificate names,
• observed axioms,
• Lean/toolchain environment,
• service identity and signature metadata.

The agent can consume that certificate only when the provider is explicitly trusted:

pacta agent --config examples/repos.yaml \
  --repo-name dalek-ed25519-verified \
  --attestation examples/dalek-ed25519.attestation.yaml \
  --trust-attestation-provider example-proof-checker.invalid \
  --action build-library

This changes the trusted base. The agent is no longer trusting local Lean replay; it is trusting the proof-checking service, its environment, signing key custody, and log retention. Without an explicitly trusted provider, attestation evidence scores R0.

The included examples/dalek-ed25519.attestation.yaml is a schema/demo fixture. A production service should publish verifiable signatures, transparency-log entries, and reproducible logs; the prototype records signature metadata but does not yet implement cryptographic signature verification.

Truth Boundary

The Ed25519 repositories should not be marketed as fully verified wallets or fully verified Ed25519 end-to-end. The strongest current claim is lower-layer and theorem-bound:

For selected curve25519-dalek / Solana-Ed25519-family Rust code paths already transpiled into Lean, the repositories contain Lean-checked certificates for field arithmetic over F_p, p = 2^255 - 19, and complete twisted Edwards point-operation laws, under explicit invariants and backend constraints.

pacta treats these as out of scope unless separately proven:

• Full EdDSA signature verification.
• Complete Scalar52 arithmetic.
• SHA-512.
• Encoding, decoding, and canonicality.
• Rust compiler correctness.
• Charon/Aeneas translation faithfulness.
• Side-channel resistance.
• SIMD, AVX, hardware, zkVM, accelerator, or syscall paths.
• Wallet policy, transaction construction, RPC, chain, oracle, market, and LLM decision safety.

Risk Levels

• R0: Unknown or untrusted. No usable evidence.
• R1: Tests, audits, or informal claims only.
• R2: Formal model exists, but it is incomplete, weakly tied to production code, or major proof gaps remain.
• R3: A specific lower-layer implementation artifact is Lean-checked for a specific backend and theorem boundary.
• R4: End-to-end primitive proof covers public API, parsing/encoding, scalar arithmetic, hashing interface, signature equation, rejection rules, and implementation boundary.
• R5: R4 plus reproducible production builds, compiler/build assurance, side-channel analysis, hardware/KMS/MPC integration, and operational controls.

Expected first-pass classification: Ed25519 field plus Edwards point arithmetic can reach R3 if configured certificates compile and the axiom audit is clean. Full Ed25519 signature verification remains R2 or lower unless complete scalar, encoding, hashing, and signature certificates exist.