Pith Number

pith:EUP6V7YP

pith:1996:EUP6V7YPPBAL3CVOOWPAZBDKOP

not attested not anchored not stored refs pending

The QSO evolution derived from the HBQS and other complete QSO surveys

Fabio La Franca (Dip. di Fisica, Stefano Cristiani (Dip. di Astronomia, Univ. di Padova), Univ. Roma Tre)

arxiv:astro-ph/9612181 v1 · 1996-12-18 · 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{EUP6V7YPPBAL3CVOOWPAZBDKOP}

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	2026-05-18T01:21:49.969725Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

251feaff0f7840bd8aae759e0c846a73df2b91dd3833d2a68645f62100cbe2d9

Aliases

arxiv: astro-ph/9612181 · arxiv_version: astro-ph/9612181v1 · doi: 10.48550/arxiv.astro-ph/9612181 · pith_short_12: EUP6V7YPPBAL · pith_short_16: EUP6V7YPPBAL3CVO · pith_short_8: EUP6V7YP

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/EUP6V7YPPBAL3CVOOWPAZBDKOP \
  | 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: 251feaff0f7840bd8aae759e0c846a73df2b91dd3833d2a68645f62100cbe2d9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5fb77075132bfd979ae7854a24940c89d0b4d75ab8bd6f3385afad5955124284",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1996-12-18T15:13:12Z",
    "title_canon_sha256": "e863a58f7ec672c6a2f17dc3235bfabc33d2e0579c352cf9acc9e587887c516b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9612181",
    "kind": "arxiv",
    "version": 1
  }
}