FOCS Artifact Evaluation

There is no artifact-evaluation committee, badge system, or code-submission channel at FOCS — the 2026 CFP contains none of that machinery (checked 2026-07-08). What it does contain is an expectation with teeth: authors of accepted papers are expected to make full versions, with complete proofs, publicly available by the camera-ready deadline. Read that as the venue's actual artifact policy. The proceedings entry in IEEE Xplore is the citable announcement; the public full version is the object the community will actually consult, teach from, and check. Plan the evidence around that split from day one, not after acceptance.

The FOCS evidence inventory

Packaging a certificate that strangers can trust

The trust chain for a computer-assisted step must survive your own infrastructure disappearing. A packaging recipe that does:

# Everything a verifier needs, content-addressed and self-describing
mkdir lemma47-certificate
cp check_lemma47.py configs.enum README-VERIFY.md lemma47-certificate/
sha256sum lemma47-certificate/* > lemma47-certificate/SHA256SUMS
git tag -a focs2026-submitted -m "state at FOCS submission"
# README-VERIFY.md states: input, claim certified, expected output,
# runtime (~90 s), and environment ("Python 3.12, stdlib only")

Include the certificate directory with the arXiv upload as ancillary files so it shares the paper's persistence guarantees — a departmental URL in a proof is a dead link on the timescale over which FOCS papers stay relevant. If the certificate is huge (SAT traces can reach gigabytes), archive it with a DOI service and print the hash in the paper so the object stays pinned even if re-hosted.

Version ledger: keeping three documents honest

The submission, the public full version, and the proceedings version drift unless actively synchronized. Keep a ledger in the repository:

• focs2026-submitted tag — exactly what HotCRP received.
• Full-version updates — each with a changelog entry ("v2: fixed sign error in Lemma 6.3; theorem statements unchanged"); statement changes are breaking events that require flagging, not silent repair (focs-reproducibility).
• Proceedings version — page-limited derivative; every omission points to the full version ("complete proof in the full version, Section 7").

Under double-blind, the full version may already be public under your names at submission time; theory practice accepts this, but the submission must still not self-identify (focs-submission).

What not to build

Effort spent on ML-conference artifact rituals is effort taken from proofs. At this venue, skip: Docker images for illustration scripts (a README and a pinned interpreter version suffice for code carrying no proof weight); anonymized artifact links inside the submission (there is no artifact reviewer to follow them — certificates ride with the paper or its ancillary files); interactive demos and websites (theory referees want the object, not the experience); and any "artifact appendix" section formatted after systems-conference templates. The single question that allocates effort correctly: will a skeptical reader in ten years need this object to believe the theorem? If yes, engineer it to survive ten years; if no, a courtesy link is enough.

Formalization claims, calibrated

Mechanized proofs are appearing in the FOCS orbit, and miscalibrated claims about them are a new failure mode. If you formalize, state coverage precisely: "Theorem 1 and Lemmas 3.1–3.4 are verified in Lean 4 (commit a3f9c2); the reduction in Section 6 is not formalized." A blanket "our results are machine-verified" claim that a reviewer falsifies by opening the repository costs more credibility than formalizing nothing.

Choosing the host: arXiv vs ECCC

Both satisfy the CFP's expectation; the choice is about audience and mechanics. arXiv offers subject-class reach beyond TCS, ancillary-file support, and version history readable by everyone; ECCC (the Electronic Colloquium on Computational Complexity) offers a complexity-native audience, lightweight community screening, and a numbering scheme the complexity literature cites natively. Complexity-central papers often post to both. Whichever you choose, pick the arXiv license deliberately — the minimal arXiv license keeps journal options maximally open, while CC licenses ease reuse; and remember the proceedings version will carry an IEEE copyright, so the full version is where your distribution freedom lives.

Planning sequence

1. At project start: decide which lemmas, if any, will be computer-assisted; those need certificate engineering, not retrofitting.
2. At submission: repository tagged; certificates packaged; full version ready to post (or already posted) on arXiv/ECCC.
3. At acceptance: execute the camera-ready double deliverable (focs-camera-ready) and make the public record complete before the conference — the New York talk should point at a live, final full version.