Pith Number

pith:FXBPV2VX

pith:2017:FXBPV2VXPP3Y3OC2CRYICGJEIV

not attested not anchored not stored refs pending

SDSS J1640+1932: a spectacular galaxy-quasar strong lens system

Guilin Liu, Lin Wang, Ran Li, Yiping Shu, Zheng Zheng, Zhonglue Wen

arxiv:1703.07495 v1 · 2017-03-22 · astro-ph.GA

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{FXBPV2VXPP3Y3OC2CRYICGJEIV}

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	2026-05-18T00:44:51.333836Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2dc2faeab77bf78db85a1470811924454376f3e4ed1babd9ef653f12a9242c32

Aliases

arxiv: 1703.07495 · arxiv_version: 1703.07495v1 · doi: 10.48550/arxiv.1703.07495 · pith_short_12: FXBPV2VXPP3Y · pith_short_16: FXBPV2VXPP3Y3OC2 · pith_short_8: FXBPV2VX

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/FXBPV2VXPP3Y3OC2CRYICGJEIV \
  | 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: 2dc2faeab77bf78db85a1470811924454376f3e4ed1babd9ef653f12a9242c32

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b52d9e21dc92c50975a19df0b5518727ba9259c610eba0b14b329a7bed77d227",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2017-03-22T02:29:11Z",
    "title_canon_sha256": "a09929ac716717541e254ad2f3e10767bf279ffa8bef85b2e56f4f1b1f1ba798"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1703.07495",
    "kind": "arxiv",
    "version": 1
  }
}