Pith Number

pith:GI23PIFR

pith:2009:GI23PIFR2QOYNIGUIIR2WBUTRL

not attested not anchored not stored refs pending

CASSOWARY 20: a Wide Separation Einstein Cross Identified with the X-shooter Spectrograph

(2) European Southern Observatory, (3) Max Planck Institute for Astronomy), Elena Mason (2), Joel Vernet (2) ((1) Institute of Astronomy, Lise Christensen (2), Max Pettini (1), N. Wyn Evans (1), Paul C. Hewett (1), Sandro D'Odorico (2), Sergey Koposov (3), University of Cambridge, Vasily Belokurov (1)

arxiv:0909.3301 v2 · 2009-09-17 · 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{GI23PIFR2QOYNIGUIIR2WBUTRL}

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	2026-05-18T02:11:46.712824Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3235b7a0b1d41d86a0d44223ab06938af0feb51bbb92e83aa763899604a7da5e

Aliases

arxiv: 0909.3301 · arxiv_version: 0909.3301v2 · doi: 10.48550/arxiv.0909.3301 · pith_short_12: GI23PIFR2QOY · pith_short_16: GI23PIFR2QOYNIGU · pith_short_8: GI23PIFR

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/GI23PIFR2QOYNIGUIIR2WBUTRL \
  | 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: 3235b7a0b1d41d86a0d44223ab06938af0feb51bbb92e83aa763899604a7da5e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "69ca5def7e5876065b896a49635929e55b3540ca9d0387eab066f65d392f08a8",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-09-17T20:00:30Z",
    "title_canon_sha256": "dcb841f601cad405da45e84443903528cd6e8bc55f5e7afcdd7a477d9b0b8013"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0909.3301",
    "kind": "arxiv",
    "version": 2
  }
}