Pith Number

pith:SQRWK4OU

pith:2009:SQRWK4OU5MPPDCQ3O7JSUPGEIL

not attested not anchored not stored refs pending

The evolution of the mass-metallicity relation in galaxies of different morphological types

4), A. Pipino (2), C. Chiappini (3, F. Calura (1), F. Matteucci (1, Italy), Italy; (2) University of Southern California, Italy; (5) INAF-Oss. di Roma, R. Maiolino (5) - ((1) Univ. Trieste, Switzerland; (4) INAF-Oss. di Trieste, USA; (3) Obs. de Geneve

arxiv:0904.2180 v1 · 2009-04-14 · 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{SQRWK4OU5MPPDCQ3O7JSUPGEIL}

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	2026-05-18T02:14:00.497276Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

94236571d4eb1ef18a1b77d32a3cc442e291cb7d8ecdf50a320622218999b22b

Aliases

arxiv: 0904.2180 · arxiv_version: 0904.2180v1 · doi: 10.48550/arxiv.0904.2180 · pith_short_12: SQRWK4OU5MPP · pith_short_16: SQRWK4OU5MPPDCQ3 · pith_short_8: SQRWK4OU

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/SQRWK4OU5MPPDCQ3O7JSUPGEIL \
  | 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: 94236571d4eb1ef18a1b77d32a3cc442e291cb7d8ecdf50a320622218999b22b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a85bf1842fb4a1932364afc0712ed0a21bcb17f81770790d22fe0e3b5d639479",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-04-14T20:16:30Z",
    "title_canon_sha256": "a061c9b66fdc95471c6c2ae1e69d443f4425535f297d472e78cc3865464bdc2d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.2180",
    "kind": "arxiv",
    "version": 1
  }
}