Pith Number

pith:QKUPDCAJ

pith:2009:QKUPDCAJTKOUVE3U46JPZ5PG6B

not attested not anchored not stored refs pending

Extremely-Metal Poor Stars in the Milky Way: A Second Generation Formed after Reionization

((1) U Colorado), Michael Shull (1), Michele Trenti (1)

arxiv:0905.4505 v2 · 2009-05-27 · astro-ph.GA · astro-ph.CO

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QKUPDCAJTKOUVE3U46JPZ5PG6B}

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	2026-05-18T02:13:31.439759Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

82a8f188099a9d4a9374e792fcf5e6f0549e5348224c4491fb82733c956e8284

Aliases

arxiv: 0905.4505 · arxiv_version: 0905.4505v2 · doi: 10.48550/arxiv.0905.4505 · pith_short_12: QKUPDCAJTKOU · pith_short_16: QKUPDCAJTKOUVE3U · pith_short_8: QKUPDCAJ

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/QKUPDCAJTKOUVE3U46JPZ5PG6B \
  | 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: 82a8f188099a9d4a9374e792fcf5e6f0549e5348224c4491fb82733c956e8284

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d955404740f1361f9674419cd6be7b76a7e1c1070ceb5c09c301da936b93d464",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-05-27T20:17:32Z",
    "title_canon_sha256": "d3e0ad4e50c4aa1ee454a0ebbfa56349e3e76d8d9072a71e894b4386b18a3609"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0905.4505",
    "kind": "arxiv",
    "version": 2
  }
}