Pith Number

pith:WYKIPZZU

pith:2007:WYKIPZZUSKGHFTUAGSLUHF3IZW

not attested not anchored not stored refs pending

Are the most metal-poor galaxies young?

Daniel Kunth (Institut Astrophysique de Paris, France; kunth at iap.fr), Goran Ostlin (Stockholm Observatory, Sweden; ostlin at astro.su.se)

arxiv:0704.3803 v1 · 2007-04-28 · 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{WYKIPZZUSKGHFTUAGSLUHF3IZW}

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	2026-05-18T02:16:31.334153Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b61487e734928c72ce803497439768cd913bf1a8e9d59acd63cb4c2eb971dc59

Aliases

arxiv: 0704.3803 · arxiv_version: 0704.3803v1 · doi: 10.48550/arxiv.0704.3803 · pith_short_12: WYKIPZZUSKGH · pith_short_16: WYKIPZZUSKGHFTUA · pith_short_8: WYKIPZZU

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/WYKIPZZUSKGHFTUAGSLUHF3IZW \
  | 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: b61487e734928c72ce803497439768cd913bf1a8e9d59acd63cb4c2eb971dc59

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "eb5ed6a262559927c7b93f65510f0f43251892bff478dd41e2f4601505cb0442",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2007-04-28T15:36:36Z",
    "title_canon_sha256": "fc6b60ec872fe5e25ce7e49d29f4c5c9720e591a2e8112f1cf4658b294aed554"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0704.3803",
    "kind": "arxiv",
    "version": 1
  }
}