Pith Number

pith:KJWGT7E2

pith:2011:KJWGT7E2GXI3C4GXIQDOIFME7W

not attested not anchored not stored refs pending

Discovering the missing 2.2<z<3 quasars by combining optical variability and optical/near-IR colors

Fuyan Bian, Kasper B. Schmidt, Linhua Jiang, Ran Wang, Xiaohui Fan, Xue-Bing Wu

arxiv:1107.0646 v1 · 2011-07-04 · 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{KJWGT7E2GXI3C4GXIQDOIFME7W}

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	2026-05-18T02:01:25.113358Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

526c69fc9a35d1b170d74406e41584fdb18916be1182a7a5a3c6f1fe58bc30d9

Aliases

arxiv: 1107.0646 · arxiv_version: 1107.0646v1 · doi: 10.48550/arxiv.1107.0646 · pith_short_12: KJWGT7E2GXI3 · pith_short_16: KJWGT7E2GXI3C4GX · pith_short_8: KJWGT7E2

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/KJWGT7E2GXI3C4GXIQDOIFME7W \
  | 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: 526c69fc9a35d1b170d74406e41584fdb18916be1182a7a5a3c6f1fe58bc30d9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1f69ff212d63aa59166dc7c558b1836f1b5148a02015323de083152f376a85a7",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-sa/3.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2011-07-04T15:00:24Z",
    "title_canon_sha256": "4def1a21ad68365d2409f0fbac0f05614bea491e0ec792874d7a0d310d36a82c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1107.0646",
    "kind": "arxiv",
    "version": 1
  }
}