Pith Number

pith:VHF3GR6U

pith:2015:VHF3GR6UMKWK7DKBLOGM5CBYAE

not attested not anchored not stored refs pending

Witnessing the transformation of a quasar host galaxy at z=1.6

2), A. Humphrey (1, B.H.C. Emonts (3), B. Oca\~na Flaquer (1), I. Aretxaga (2), J.M. Gomes (1), J. Torrealba (2) ((1) Instituto de Astrof\'isica e Ci\^encias do Espa\c{c}o, L. Binette (4), M.E. Filho (1), Mexico), Mexico (3) Centro de Astrobiolog\'ia (INTA-CSIC), M. Villar-Mart\'in (3), N. Roche (1), P. Lagos (1), Portugal (2) Instituto Nacional de Astrof\'isica, P. Papaderos (1), Spain (4) Instituto de Astronom\'ia, Universidade do Porto, Universidad Nacional Aut\'onoma de M\'exico

arxiv:1501.04442 v2 · 2015-01-19 · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{VHF3GR6UMKWK7DKBLOGM5CBYAE}

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	2026-05-18T01:41:10.292457Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a9cbb347d462acaf8d415b8cce883801226fae1cbd78c8a560ea66c6b509f2a7

Aliases

arxiv: 1501.04442 · arxiv_version: 1501.04442v2 · doi: 10.48550/arxiv.1501.04442 · pith_short_12: VHF3GR6UMKWK · pith_short_16: VHF3GR6UMKWK7DKB · pith_short_8: VHF3GR6U

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/VHF3GR6UMKWK7DKBLOGM5CBYAE \
  | 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: a9cbb347d462acaf8d415b8cce883801226fae1cbd78c8a560ea66c6b509f2a7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "45fd920b4b9380f3fe69c8d6ae67ae5efb5771ec527d3b581bcdd7e345a023fa",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2015-01-19T10:28:36Z",
    "title_canon_sha256": "32c177acffdcc56f1388266b1f708a485bfe96ad18b0ff5a0c1b2ba61541af67"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1501.04442",
    "kind": "arxiv",
    "version": 2
  }
}