Pith Number

pith:23SPE75E

pith:2007:23SPE75E5DN5S3HC54TAKFLJ66

not attested not anchored not stored refs pending

Metal Absorption Systems in Spectra of Pairs of QSOs

Angela Chapman, Arlin P.S. Crotts, Carl Melis, Dan Lubin, David Kirkman, David Tytler, Mark Gleed, Pascal Paschos, Tridivesh Jena

arxiv:0711.2308 v2 · 2007-11-15 · 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{23SPE75E5DN5S3HC54TAKFLJ66}

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	2026-05-18T00:51:52.806129Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d6e4f27fa4e8dbd96ce2ef26051569f7acdeffcc12e2eba34f2e14c54f113bc9

Aliases

arxiv: 0711.2308 · arxiv_version: 0711.2308v2 · doi: 10.48550/arxiv.0711.2308 · pith_short_12: 23SPE75E5DN5 · pith_short_16: 23SPE75E5DN5S3HC · pith_short_8: 23SPE75E

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/23SPE75E5DN5S3HC54TAKFLJ66 \
  | 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: d6e4f27fa4e8dbd96ce2ef26051569f7acdeffcc12e2eba34f2e14c54f113bc9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7ba092e540556e2d1cc0d3d278e5ba79df502c31cefebb7aac918a50e67a317e",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2007-11-15T20:58:15Z",
    "title_canon_sha256": "1a57cfb6dece0663a7bd0a5c534154c15604388beded8cc4821d772c0e913ac5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0711.2308",
    "kind": "arxiv",
    "version": 2
  }
}