Pith Number

pith:2F5KS5VY

pith:2026:2F5KS5VYUB6MBMKKUTP3DMY523

not attested not anchored not stored refs pending

FlexAct: Why Learn when you can Pick?

Cho-Jui Hsieh, Junmin Judy, Kyle Ritscher, Lawrence Liu, Ramnath Kumar

arxiv:2601.06441 v2 · 2026-01-10 · cs.LG

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2F5KS5VYUB6MBMKKUTP3DMY523}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-07-08T01:18:24.084691Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d17aa976b8a07cc0b14aa4dfb1b31dd6c1f55112ae617b523b03c78ee66ecd4b

Aliases

arxiv: 2601.06441 · arxiv_version: 2601.06441v2 · doi: 10.48550/arxiv.2601.06441 · pith_short_12: 2F5KS5VYUB6M · pith_short_16: 2F5KS5VYUB6MBMKK · pith_short_8: 2F5KS5VY

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/2F5KS5VYUB6MBMKKUTP3DMY523 \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: d17aa976b8a07cc0b14aa4dfb1b31dd6c1f55112ae617b523b03c78ee66ecd4b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dbb3dd003ad0dcb8b93a70b09cdbd1be99f544ca81e28fd8dedf69dfc5224d35",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2026-01-10T05:51:25Z",
    "title_canon_sha256": "2e01bf1a24dc283ec5b130fe9bfc6fd417ef9110b0475042ec9a71608fb1faee"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2601.06441",
    "kind": "arxiv",
    "version": 2
  }
}