Pith Number

pith:VK4K2SXD

pith:2007:VK4K2SXD6FUGUOXZM6KHIAJINN

not attested not anchored not stored refs pending

The UV colours of high-redshift early-type galaxies: evidence for recent star formation and stellar mass assembly over the last 8 billion years

C. Cardamone, C. M. Urry, E. Gawiser, J. Silk, K. Schawinski, P. G. van Dokkum, S. Kaviraj, S. Khochfar, S. K. Yi, S. N. Virani

arxiv:0709.0806 v1 · 2007-09-06 · 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{VK4K2SXD6FUGUOXZM6KHIAJINN}

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	2026-07-04T17:05:29.260845Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

aab8ad4ae3f1686a3af967947401286b7f71dcf6585300500b777c649424a5d1

Aliases

arxiv: 0709.0806 · arxiv_version: 0709.0806v1 · doi: 10.48550/arxiv.0709.0806 · pith_short_12: VK4K2SXD6FUG · pith_short_16: VK4K2SXD6FUGUOXZ · pith_short_8: VK4K2SXD

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/VK4K2SXD6FUGUOXZM6KHIAJINN \
  | 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: aab8ad4ae3f1686a3af967947401286b7f71dcf6585300500b777c649424a5d1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a53dd07fcac270e713e55b7b50f2cd4fe0c056cd6a0b6ed8f2dc9a05b2da1e53",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2007-09-06T10:09:58Z",
    "title_canon_sha256": "ccc3eb411052d1aa2f717313d8009b83b8118ef2019f16577db9fe96c60adb45"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0709.0806",
    "kind": "arxiv",
    "version": 1
  }
}