Pith Number

pith:HYBU7DJO

pith:2009:HYBU7DJO3NUDI7VPTGK7IP3QZ4

not attested not anchored not stored refs pending

A complete sample of 21-cm absorbers at z~1.3: Giant Metrewave Radio Telescope Survey Using MgII Systems

D. J. Saikia (NCRA), N. Gupta (ATNF), P. Noterdaeme (IUCAA), P. Petitjean (IAP), R. Srianand (IUCAA)

arxiv:0904.2878 v1 · 2009-04-19 · astro-ph.CO · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HYBU7DJO3NUDI7VPTGK7IP3QZ4}

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	2026-05-18T02:13:59.166187Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3e034f8d2edb68347eaf9995f43f70cf38f65150831dc57c96b42a0a2218e5e8

Aliases

arxiv: 0904.2878 · arxiv_version: 0904.2878v1 · doi: 10.48550/arxiv.0904.2878 · pith_short_12: HYBU7DJO3NUD · pith_short_16: HYBU7DJO3NUDI7VP · pith_short_8: HYBU7DJO

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/HYBU7DJO3NUDI7VPTGK7IP3QZ4 \
  | 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: 3e034f8d2edb68347eaf9995f43f70cf38f65150831dc57c96b42a0a2218e5e8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "85bbed24c7354078efe0c6fe7e8e8716ada4a1430357ac0f4c5cf30e697152ec",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-04-19T02:59:18Z",
    "title_canon_sha256": "8821312087acece696d8c034e694609ef46070ec2e10cfce62454ac0cc83e70a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.2878",
    "kind": "arxiv",
    "version": 1
  }
}