Pith Number

pith:QIGADJVO

pith:2008:QIGADJVOPEWDHWKKWJ5YGVHRHH

not attested not anchored not stored refs pending

An extreme EXO: a type 2 QSO at z=1.87

A. Del Moro, F. J. Carrera, G. Stewart, K. Ohta, M. Akiyama, M. G. Watson, N. Tamura, S. Mateos, Y. Hashimoto

arxiv:0810.0544 v1 · 2008-10-02 · 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{QIGADJVOPEWDHWKKWJ5YGVHRHH}

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	2026-07-04T17:13:04.042388Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

820c01a6ae792c33d94ab27b8354f139e9285250a20b657e333174e8752b43b2

Aliases

arxiv: 0810.0544 · arxiv_version: 0810.0544v1 · doi: 10.48550/arxiv.0810.0544 · pith_short_12: QIGADJVOPEWD · pith_short_16: QIGADJVOPEWDHWKK · pith_short_8: QIGADJVO

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/QIGADJVOPEWDHWKKWJ5YGVHRHH \
  | 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: 820c01a6ae792c33d94ab27b8354f139e9285250a20b657e333174e8752b43b2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c18a96a2cb0ae44de1b09c5e2086b1f3d202936085e58ab642730719997e10f0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-10-02T22:58:06Z",
    "title_canon_sha256": "bf0a2639cbafda310bf937ac9b56d8898f4cebef85d181df868316e2b4927f2e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0810.0544",
    "kind": "arxiv",
    "version": 1
  }
}