Pith Number

pith:7BCDLJUD

pith:2007:7BCDLJUDQ23WMVVUCENJZKAVTG

not attested not anchored not stored refs pending

On the Spectral Evolution of Cool, Helium-Atmosphere White Dwarfs: Detailed Spectroscopic and Photometric Analysis of DZ Stars

G.R. Knapp, H. C. Harris, James Liebert, Matt C. Edwards, Matthew J. Collinge, Michael A. Strauss, Patrick B. Hall, P. Bergeron, P. Dufour

arxiv:astro-ph/0703758 v1 · 2007-03-29 · 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{7BCDLJUDQ23WMVVUCENJZKAVTG}

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	2026-07-04T15:21:58.238528Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f84435a68386b76656b4111a9ca81599b3e0c8a3f1bf9fed0558def5b560b716

Aliases

arxiv: astro-ph/0703758 · arxiv_version: astro-ph/0703758v1 · doi: 10.48550/arxiv.astro-ph/0703758 · pith_short_12: 7BCDLJUDQ23W · pith_short_16: 7BCDLJUDQ23WMVVU · pith_short_8: 7BCDLJUD

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/7BCDLJUDQ23WMVVUCENJZKAVTG \
  | 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: f84435a68386b76656b4111a9ca81599b3e0c8a3f1bf9fed0558def5b560b716

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8e90ca3a85f2d6260f7aabbc41937aa8a7f8f075a2d8b607b69eec5d50e62177",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2007-03-29T12:58:57Z",
    "title_canon_sha256": "8d50d2e96378afa50f7e6663b45198f7e980445f644ab9773236f116395d11e6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0703758",
    "kind": "arxiv",
    "version": 1
  }
}