Pith Number

pith:PFRS7Z7G

pith:1996:PFRS7Z7G75E6AQR4KOAF3RIIVB

not attested not anchored not stored refs pending

Hubble Space Telescope Images of a Sample of Twenty Nearby Luminous Quasars

David H. Saxe, Donald P. Schneider, John N. Bahcall, Sofia Kirhakos

arxiv:astro-ph/9611163 v2 · 1996-11-20 · 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{PFRS7Z7G75E6AQR4KOAF3RIIVB}

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	2026-05-18T04:18:14.289779Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

79632fe7e6ff49e0423c53805dc508a8634a5c7174eacb57999fb219c26c451b

Aliases

arxiv: astro-ph/9611163 · arxiv_version: astro-ph/9611163v2 · doi: 10.48550/arxiv.astro-ph/9611163 · pith_short_12: PFRS7Z7G75E6 · pith_short_16: PFRS7Z7G75E6AQR4 · pith_short_8: PFRS7Z7G

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/PFRS7Z7G75E6AQR4KOAF3RIIVB \
  | 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: 79632fe7e6ff49e0423c53805dc508a8634a5c7174eacb57999fb219c26c451b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8d49dbccbc563cd61208a1fed4297036fa5e75f04baf9b9d4d8a6f6719ab5a73",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1996-11-20T17:22:31Z",
    "title_canon_sha256": "a7372c82ee909681d5999c9f9b738622493f45b1ed00063730c227cf2f3c01bb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9611163",
    "kind": "arxiv",
    "version": 2
  }
}