Pith Number

pith:U2BK5QQL

pith:2009:U2BK5QQL6WGVHQIVYYAMQPJYXF

not attested not anchored not stored refs pending

Stellar population gradients in early-type cluster galaxies

J. R. Lucey (Durham University), Russell J. Smith, T. D. Rawle

arxiv:0909.3844 v1 · 2009-09-21 · 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{U2BK5QQL6WGVHQIVYYAMQPJYXF}

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	2026-05-18T02:11:45.639413Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a682aec20bf58d53c115c600c83d38b96f0907d8fe28444df01216d6dd8ab61b

Aliases

arxiv: 0909.3844 · arxiv_version: 0909.3844v1 · doi: 10.48550/arxiv.0909.3844 · pith_short_12: U2BK5QQL6WGV · pith_short_16: U2BK5QQL6WGVHQIV · pith_short_8: U2BK5QQL

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/U2BK5QQL6WGVHQIVYYAMQPJYXF \
  | 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: a682aec20bf58d53c115c600c83d38b96f0907d8fe28444df01216d6dd8ab61b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "aad98919f9ab7c413ee0ebb2d8af7fa068f8bc81e9ccb12b2fa8ec292db2a102",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-09-21T20:00:09Z",
    "title_canon_sha256": "9524bf9c80a28612807ccd27d221d30f9d22fd25824120bab52ecf99d28906c1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0909.3844",
    "kind": "arxiv",
    "version": 1
  }
}