Pith Number

pith:7YWC54MQ

pith:1999:7YWC54MQYPR4ONN4XNMPVU34S2

not attested not anchored not stored refs pending

The Nearest Group of Galaxies

Sidney van den Bergh

arxiv:astro-ph/9904425 v1 · 1999-04-30 · 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{7YWC54MQYPR4ONN4XNMPVU34S2}

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	2026-05-18T01:07:36.430882Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fe2c2ef190c3e3c735bcbb58fad37c96a319c1a9101c5ff8023eb6bff24fe20b

Aliases

arxiv: astro-ph/9904425 · arxiv_version: astro-ph/9904425v1 · doi: 10.48550/arxiv.astro-ph/9904425 · pith_short_12: 7YWC54MQYPR4 · pith_short_16: 7YWC54MQYPR4ONN4 · pith_short_8: 7YWC54MQ

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/7YWC54MQYPR4ONN4XNMPVU34S2 \
  | 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: fe2c2ef190c3e3c735bcbb58fad37c96a319c1a9101c5ff8023eb6bff24fe20b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9dc42c6b345ff2a160fd4c02475582f1f9adb90d96855f1c09aed2da922e98c4",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-04-30T19:33:10Z",
    "title_canon_sha256": "af6ccb967a7d53c465f48e2ee4a289e35e7488af283c71afe6aba3c853e2588e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9904425",
    "kind": "arxiv",
    "version": 1
  }
}