Pith Number

pith:2K7DSGFM

pith:2004:2K7DSGFMHZUSR4PO42MQEWKMLF

not attested not anchored not stored refs pending

The Mysterious Absence of Neutral Hydrogen within One Mpc of a Luminous Quasar at Redshift 2.168

Joss Bland-Hawthorn (AAO), Paul J. Francis (ANU)

arxiv:astro-ph/0405506 v1 · 2004-05-25 · 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{2K7DSGFMHZUSR4PO42MQEWKMLF}

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	2026-05-18T04:27:04.496661Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d2be3918ac3e6928f1eee69902594c5971c1705c9f8bac8690d5260fc4645ac9

Aliases

arxiv: astro-ph/0405506 · arxiv_version: astro-ph/0405506v1 · doi: 10.48550/arxiv.astro-ph/0405506 · pith_short_12: 2K7DSGFMHZUS · pith_short_16: 2K7DSGFMHZUSR4PO · pith_short_8: 2K7DSGFM

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/2K7DSGFMHZUSR4PO42MQEWKMLF \
  | 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: d2be3918ac3e6928f1eee69902594c5971c1705c9f8bac8690d5260fc4645ac9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "93872c691a0a56bc2b94c89ae96c16007d57d0b00e82f9085a4f5c10b4676b39",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-05-25T21:06:29Z",
    "title_canon_sha256": "bd042cd41564853b3da67a81ac73a6fcc615a6e60c4998c2df6ff806f3369e20"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0405506",
    "kind": "arxiv",
    "version": 1
  }
}