Pith Number

pith:E5Q7GAZ4

pith:1999:E5Q7GAZ4VF6OND4DLK32AMU24O

not attested not anchored not stored refs pending

Are spiral galaxies optically thin or thick?

E.M. Xilouris, E.V. Paleologou, J. Papamastorakis, N.D. Kylafis, Y.I. Byun

arxiv:astro-ph/9901158 v1 · 1999-01-13 · 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{E5Q7GAZ4VF6OND4DLK32AMU24O}

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.

Cited by

1 paper in Pith

An Integral Field Spectroscopy Study Of Thin And Thick Discs In IC 2531

Receipt and verification

First computed	2026-07-04T15:51:14.368560Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2761f3033ca97ce68f835ab7a0329ae3a96948d4219f69b63ad72586fd8a7a01

Aliases

arxiv: astro-ph/9901158 · arxiv_version: astro-ph/9901158v1 · doi: 10.48550/arxiv.astro-ph/9901158 · pith_short_12: E5Q7GAZ4VF6O · pith_short_16: E5Q7GAZ4VF6OND4D · pith_short_8: E5Q7GAZ4

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/E5Q7GAZ4VF6OND4DLK32AMU24O \
  | 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: 2761f3033ca97ce68f835ab7a0329ae3a96948d4219f69b63ad72586fd8a7a01

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5521613bc7e47a21ce20f200a773d9f081f6a4cb797aa5b1db2bd1dcfbd4242a",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-01-13T04:42:46Z",
    "title_canon_sha256": "f26ba7d00bd1c420941b6f6c9e3f911d6b26896a9034d978e46022bf72cdc91b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9901158",
    "kind": "arxiv",
    "version": 1
  }
}