Pith Number

pith:VGC7BGA3

pith:2008:VGC7BGA3XNRZ72RURQSGKY7QPB

not attested not anchored not stored refs pending

Detecting quasars at very high redshift with next generation X-ray telescopes

Cambridge), Kirsty J. Rhook (1), Martin G. Haehnelt (1) ((1) Institute of Astronomy

arxiv:0801.3482 v2 · 2008-01-22 · 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{VGC7BGA3XNRZ72RURQSGKY7QPB}

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	2026-07-04T17:08:56.827682Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a985f0981bbb639fea348c246563f0787be98c4c6db1fad94739ca69a9216cd1

Aliases

arxiv: 0801.3482 · arxiv_version: 0801.3482v2 · doi: 10.48550/arxiv.0801.3482 · pith_short_12: VGC7BGA3XNRZ · pith_short_16: VGC7BGA3XNRZ72RU · pith_short_8: VGC7BGA3

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/VGC7BGA3XNRZ72RURQSGKY7QPB \
  | 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: a985f0981bbb639fea348c246563f0787be98c4c6db1fad94739ca69a9216cd1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7717cc17706e63774c0546160c63b3bdfee938d0a0e9c2e64d618a577784bb8c",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-01-22T23:53:23Z",
    "title_canon_sha256": "ee7fcba6a5b193a7c2f3ff077d739f71003e7bcab7b97f4c7ed3c54f116b3a22"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0801.3482",
    "kind": "arxiv",
    "version": 2
  }
}