Pith Number

pith:4QCZ2DRC

pith:2001:4QCZ2DRC6G5CXKKBMVWUTR6VCG

not attested not anchored not stored refs pending

The Detection of Lyman-alpha Absorption from Nine Nearby Galaxies

(2) Institute of Astronomy, (3) Space Telescope Science Institute), Cambridge, David V. Bowen (1), J. Chris Blades (3) ((1) Princeton Observatory, Max Pettini (2)

arxiv:astro-ph/0107294 v1 · 2001-07-16 · 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{4QCZ2DRC6G5CXKKBMVWUTR6VCG}

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	2026-05-18T00:37:00.972535Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e4059d0e22f1ba2ba941656d49c7d5118c902dd0ff5520f8faa482c6611ef0e0

Aliases

arxiv: astro-ph/0107294 · arxiv_version: astro-ph/0107294v1 · doi: 10.48550/arxiv.astro-ph/0107294 · pith_short_12: 4QCZ2DRC6G5C · pith_short_16: 4QCZ2DRC6G5CXKKB · pith_short_8: 4QCZ2DRC

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/4QCZ2DRC6G5CXKKBMVWUTR6VCG \
  | 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: e4059d0e22f1ba2ba941656d49c7d5118c902dd0ff5520f8faa482c6611ef0e0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6ae2740e9a00bb2f56bba290bc3bd79579643b89d1a540711454d79ede29a1a8",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2001-07-16T23:31:12Z",
    "title_canon_sha256": "b2fa81c24d8bd6868437f1af2b0e8a65cbeb8052835607a6af2ae3b3b1904f82"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0107294",
    "kind": "arxiv",
    "version": 1
  }
}