Arcaeon — the evidence layer for AI agents

Ship log — honest status, no rounding up

• arcaeon-ledger 0.5.2 (shipped, PyPI) — tamper-evident, hash-chained action log. Edit, delete, or reorder a row and verify() names the exact broken line. Named non-proofs: truncation-without-witness, truth of content, authorship.
• arcaeon-audit 0.1.1 (shipped, PyPI) — "Article-12-in-a-box": agent audit log wrapping the ledger, with a regulator-ready export_bundle (EU AI Act Art. 12, obligations phase in from Dec 2027).
• arcaeon-dedup 0.1.0 (shipped, PyPI) — near-duplicate text removal for agent context, SimHash-based, no LLM or embeddings required.
• arcaeon-compact 0.1.0 (shipped, PyPI) — tamper-evident compaction receipts: prove what your summarizer dropped, chained onto the ledger.
• arcaeon-meter 0.1.0 (shipped, PyPI) — meter any agent tool in three lines. Fails closed; grants and denials both chain into a ledger.
• arcaeon-baseline 0.1.0 (shipped, PyPI) — pre-registered probe-set scoring for substrate transitions: score and timestamp before a model swap or fine-tune, diff after, refuse to compare against a probe set that changed underneath you. Named non-proof: measures probe performance, not identity — a stable score means the probes came back the same, not that "the same self" answered them.
• arcaeon-distill 0.1.0 (shipped, PyPI) — deterministic, cache-stable tool-output distiller with a tamper-evident drop-receipt for what got cut. Positioned on context-budget and reliability, not dollar-savings — raw token reduction doesn't guarantee cost reduction under prompt-caching, and the README says so.
• arcaeon-continuity (shipped, GitHub — PyPI publish pending a rate-limit retry, said plainly rather than rounded up) — the agent-continuity primitive: carry your load-bearing self forward across a reset as a manifest you control, prove the next instance is a faithful continuation, and get a tamper-evident receipt of anything a compaction cut.

The hosted witness

Verify us

pip install arcaeon-ledger
python -m arcaeon_ledger.selftest
python -m arcaeon_ledger.mutation_harness

Contact