Pith Number

pith:WZWDIJAU

pith:1996:WZWDIJAU5IIVTMVYQDBFG6AIRT

not attested not anchored not stored refs pending

APM z>4 QSO Survey: Spectra and Intervening Absorption Systems

C. Hazard, L.J. Storrie-Lombardi, M.J. Irwin, R.G. McMahon

arxiv:astro-ph/9604021 v1 · 1996-04-03 · 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{WZWDIJAU5IIVTMVYQDBFG6AIRT}

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	2026-07-04T15:59:37.566115Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b66c342414ea1159b2b880c25378088cf1b53cca7f28d7c04be3c903e0a56eac

Aliases

arxiv: astro-ph/9604021 · arxiv_version: astro-ph/9604021v1 · doi: 10.48550/arxiv.astro-ph/9604021 · pith_short_12: WZWDIJAU5IIV · pith_short_16: WZWDIJAU5IIVTMVY · pith_short_8: WZWDIJAU

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/WZWDIJAU5IIVTMVYQDBFG6AIRT \
  | 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: b66c342414ea1159b2b880c25378088cf1b53cca7f28d7c04be3c903e0a56eac

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f7250424f039cbea2508a75cccc0ee1a7b0d1a4cd34c438eb89bc886f2fac333",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1996-04-03T19:36:54Z",
    "title_canon_sha256": "cf1f24f77a71e77f2ed36eb23da9d90798811268aa7771ca01ade0e398513b11"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9604021",
    "kind": "arxiv",
    "version": 1
  }
}