Pith Number

pith:HHQ4U5WF

pith:2004:HHQ4U5WFADVY2CL4MRJLUCVJXI

not attested not anchored not stored refs pending

Ultraviolet Extinction Properties in the Milky Way

Geoffrey C. Clayton, Karl D. Gordon, Lynne A. Valencic

arxiv:astro-ph/0408409 v1 · 2004-08-23 · 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{HHQ4U5WFADVY2CL4MRJLUCVJXI}

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	2026-07-04T16:44:32.210212Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

39e1ca76c500eb8d097c6452ba0aa9ba10aa35ba72bd78bfdc216644b88f48c1

Aliases

arxiv: astro-ph/0408409 · arxiv_version: astro-ph/0408409v1 · doi: 10.48550/arxiv.astro-ph/0408409 · pith_short_12: HHQ4U5WFADVY · pith_short_16: HHQ4U5WFADVY2CL4 · pith_short_8: HHQ4U5WF

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/HHQ4U5WFADVY2CL4MRJLUCVJXI \
  | 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: 39e1ca76c500eb8d097c6452ba0aa9ba10aa35ba72bd78bfdc216644b88f48c1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e6607f2ca28914a446ec59884d2a9c058d71140de9fd0e469ed1fa40abb6a82e",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-08-23T17:04:55Z",
    "title_canon_sha256": "be1f20348b7e47b7aa14f054c5851c394f28df741c8c1ba500297a9ddb1000e1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0408409",
    "kind": "arxiv",
    "version": 1
  }
}