Pith Number

pith:2A73XTWE

pith:2005:2A73XTWEOI6VE27NRWZ2VQGXTH

not attested not anchored not stored refs pending

Evolution of accretion disks around massive black holes: constraints from the demography of active galactic nuclei

Guinevere Kauffmann, Qingjuan Yu, Youjun Lu

arxiv:astro-ph/0502499 v2 · 2005-02-23 · 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{2A73XTWEOI6VE27NRWZ2VQGXTH}

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	2026-07-04T16:50:53.135274Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d03fbbcec4723d526bed8db3aac0d799e8b3e09bcd60fe49c08b1e3dfeefa461

Aliases

arxiv: astro-ph/0502499 · arxiv_version: astro-ph/0502499v2 · doi: 10.48550/arxiv.astro-ph/0502499 · pith_short_12: 2A73XTWEOI6V · pith_short_16: 2A73XTWEOI6VE27N · pith_short_8: 2A73XTWE

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/2A73XTWEOI6VE27NRWZ2VQGXTH \
  | 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: d03fbbcec4723d526bed8db3aac0d799e8b3e09bcd60fe49c08b1e3dfeefa461

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "458d0d3b1ad61e6f1f9432eeedda0164bd4ba66d50ef43afe80971ff0995f6ce",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2005-02-23T22:04:51Z",
    "title_canon_sha256": "d67743baa98705a6a4b193339b1ac3c138a85b1ca24314f9961a726e3278e7e9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0502499",
    "kind": "arxiv",
    "version": 2
  }
}