Pith Number

pith:XYZDA7MM

pith:2007:XYZDA7MM55IA7CPHZX4PAAOHOP

not attested not anchored not stored refs pending

21 cm Signals from Early Ionizing Sources

Chi-Wang Shu, Jing-Mei Qiu, Jiren Liu, Li-Zhi Fang, Long-long Feng

arxiv:astro-ph/0703330 v1 · 2007-03-13 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{XYZDA7MM55IA7CPHZX4PAAOHOP}

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	2026-05-18T04:29:05.688682Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

be32307d8cef500f89e7cdf8f001c773ffbee0921a901bcc13ecd485dfba65d3

Aliases

arxiv: astro-ph/0703330 · arxiv_version: astro-ph/0703330v1 · doi: 10.48550/arxiv.astro-ph/0703330 · pith_short_12: XYZDA7MM55IA · pith_short_16: XYZDA7MM55IA7CPH · pith_short_8: XYZDA7MM

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/XYZDA7MM55IA7CPHZX4PAAOHOP \
  | 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: be32307d8cef500f89e7cdf8f001c773ffbee0921a901bcc13ecd485dfba65d3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b9b79cf37955b078d5efb702ece43a5a0085e7054c988c4c58d4ba87dcda8f30",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2007-03-13T18:22:58Z",
    "title_canon_sha256": "16c9c3671a55c256720ad611df8224d16a9a47994940c38d6cc4b3d2390cbbb3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0703330",
    "kind": "arxiv",
    "version": 1
  }
}