Pith Number

pith:FXJECA7C

pith:2022:FXJECA7CEIJPIGONBOQC5WKZIF

not attested not anchored not stored refs pending

The need for obscured supermassive black hole growth to explain quasar proximity zones in the epoch of reionization

Girish Kulkarni (TIFR), Laura C. Keating (Edinburgh), Martin G. Haehnelt (Cambridge), Sindhu Satyavolu (TIFR)

arxiv:2209.08103 v2 · 2022-09-16 · astro-ph.GA · 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{FXJECA7CEIJPIGONBOQC5WKZIF}

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	2026-07-05T05:52:08.519146Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2dd24103e22212f419cd0ba02ed9594169548408b98e29f24c33d2598a482709

Aliases

arxiv: 2209.08103 · arxiv_version: 2209.08103v2 · doi: 10.48550/arxiv.2209.08103 · pith_short_12: FXJECA7CEIJP · pith_short_16: FXJECA7CEIJPIGON · pith_short_8: FXJECA7C

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/FXJECA7CEIJPIGONBOQC5WKZIF \
  | 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: 2dd24103e22212f419cd0ba02ed9594169548408b98e29f24c33d2598a482709

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8d27f1a28efa69665ccd42dd062cbe67f6f859f014d1695056f8539bfa8c2404",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2022-09-16T18:00:01Z",
    "title_canon_sha256": "c09421d3fd05a456292a39162b11d279c67bc48e8923fe3ab8b1e89280d3933d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2209.08103",
    "kind": "arxiv",
    "version": 2
  }
}