Pith Number

pith:U2ZVSWQE

pith:2026:U2ZVSWQEN6QEPKDWKOUS6Y5F7A

not attested not anchored not stored refs pending

Weak Evolution of Cosmic Atomic Hydrogen over the Past 4.5 Billion Years

A. de la Macorra, A. Kremin, A. Meisner, Am\'elie Saintonge, B. A. Weaver, Chuan-Peng Zhang, C. Lamman, D. Bianchi, D. Brooks, Dirk Scholte, D. Kirkby, D. Schlegel, D. Sprayberry, E. Gazta\~naga, E. Sanchez, FASHI Collaboration, F. Prada, G. Gutierrez, G. Rossi, G. Tarl\'e, Hong Guo, H. Seo, Hu Zou, I. P\'erez-R\`afols, J. Aguilar, J. Moustakas, J. Silber, L. Le Guillou, Manasvee Saraf, Ming Zhu, M. Ishak, M. Landriau, M. Manera, M. Schubnell, O. Lahav, P. Doel, Peng Jiang, R. Joyce, R. Kehoe, R. Miquel, S. Ahlen, S. Juneau, S. Nadathur, T. Claybaugh, Wenlin Ma, W. J. Percival, Xiaohu Yang, Yirong Wang, Yizhou Gu, Y. P. Jing, Zhejie Ding, Zheng Zheng

arxiv:2607.05326 v1 · 2026-07-06 · astro-ph.GA · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{U2ZVSWQEN6QEPKDWKOUS6Y5F7A}

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	2026-07-07T03:19:23.734334Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a6b3595a046fa047a87653a92f63a5f80505fe57eb55e9c8b3f68adc68a2a379

Aliases

arxiv: 2607.05326 · arxiv_version: 2607.05326v1 · doi: 10.48550/arxiv.2607.05326 · pith_short_12: U2ZVSWQEN6QE · pith_short_16: U2ZVSWQEN6QEPKDW · pith_short_8: U2ZVSWQE

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/U2ZVSWQEN6QEPKDWKOUS6Y5F7A \
  | 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: a6b3595a046fa047a87653a92f63a5f80505fe57eb55e9c8b3f68adc68a2a379

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2f1c4ee35e4d65fac12aad574a880d7af4ab5b84db08636487df89237df6ccd6",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-07-06T17:02:03Z",
    "title_canon_sha256": "55bd225bed6b92bf5502a461cc0c1625de8e33eb35e7894732267382f89fbdad"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2607.05326",
    "kind": "arxiv",
    "version": 1
  }
}