Pith Number

pith:PA7NGO3S

pith:2026:PA7NGO3SCZPUFBZT7LFXBD47E5

not attested not anchored not stored refs pending

Clarifying Dead Quasars and Downsizing through the Evolution of Star-Forming Galaxies and Active Galactic Nuclei

Shingo Sumie

arxiv:2607.19428 v1 · 2026-07-20 · 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{PA7NGO3SCZPUFBZT7LFXBD47E5}

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	2026-07-23T00:23:49.394962Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

783ed33b72165f428733facb708f9f27668166a6373c8682d1f2c74652f0ea04

Aliases

arxiv: 2607.19428 · arxiv_version: 2607.19428v1 · doi: 10.48550/arxiv.2607.19428 · pith_short_12: PA7NGO3SCZPU · pith_short_16: PA7NGO3SCZPUFBZT · pith_short_8: PA7NGO3S

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/PA7NGO3SCZPUFBZT7LFXBD47E5 \
  | 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: 783ed33b72165f428733facb708f9f27668166a6373c8682d1f2c74652f0ea04

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "343b322ef0312d9f7003783b938555206e4e67c9fbb2240e82a60492350ec4db",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-07-20T18:40:11Z",
    "title_canon_sha256": "fe78225a8677ed4b8286453ac2806d7754406e3642fcbde187d37aa33ec6ee41"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2607.19428",
    "kind": "arxiv",
    "version": 1
  }
}