Pith Number

pith:US7QPSJR

pith:2012:US7QPSJRL2LS3XS2SUQQCL6N6O

not attested not anchored not stored refs pending

An Archival Chandra and XMM-Newton Survey of Type 2 Quasars

Andrew Ptak (GSFC), Jianjun Jia (JHU), Nadia Zakamska (JHU), Timothy Heckman (JHU)

arxiv:1205.0033 v2 · 2012-04-30 · astro-ph.HE · 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{US7QPSJRL2LS3XS2SUQQCL6N6O}

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	2026-05-18T01:57:42.067491Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a4bf07c9315e972dde5a9521012fcdf3b86ceeb44a880d78e3eb30973f8089cd

Aliases

arxiv: 1205.0033 · arxiv_version: 1205.0033v2 · doi: 10.48550/arxiv.1205.0033 · pith_short_12: US7QPSJRL2LS · pith_short_16: US7QPSJRL2LS3XS2 · pith_short_8: US7QPSJR

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/US7QPSJRL2LS3XS2SUQQCL6N6O \
  | 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: a4bf07c9315e972dde5a9521012fcdf3b86ceeb44a880d78e3eb30973f8089cd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c5778937d2b848e9c5494e9541104c1c3c216f940e8b42e8a354739fda4ecf4a",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2012-04-30T21:23:38Z",
    "title_canon_sha256": "23eede23d2e6eb3cac769c74acdc90d44ea0ed05e931960f442cf5e10a55be47"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1205.0033",
    "kind": "arxiv",
    "version": 2
  }
}