Pith Number

pith:OOBTDRZQ

pith:2018:OOBTDRZQBYH2GIL4GD5S5Q5UT3

not attested not anchored not stored refs pending

A quasar hiding behind two dusty absorbers. Quantifying the selection bias of metal-rich, damped Lyman-alpha absorption systems

C. Ledoux, J.-K. Krogager, J. P. U. Fynbo, K. E. Heintz, L. Christensen, P. Jakobsson, P. M{\o}ller, P. Noterdaeme, S. Geier

arxiv:1803.09805 v1 · 2018-03-26 · 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{OOBTDRZQBYH2GIL4GD5S5Q5UT3}

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	2026-05-18T00:10:02.253048Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

738331c7300e0fa3217c30fb2ec3b49ef69450a3c57af13c532772cde1ed1db5

Aliases

arxiv: 1803.09805 · arxiv_version: 1803.09805v1 · doi: 10.48550/arxiv.1803.09805 · pith_short_12: OOBTDRZQBYH2 · pith_short_16: OOBTDRZQBYH2GIL4 · pith_short_8: OOBTDRZQ

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/OOBTDRZQBYH2GIL4GD5S5Q5UT3 \
  | 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: 738331c7300e0fa3217c30fb2ec3b49ef69450a3c57af13c532772cde1ed1db5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a6044dfc32dcbcb6640fc9c0817a777791b315e89f3f80c5ebedac8e708045a1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2018-03-26T19:25:24Z",
    "title_canon_sha256": "bbebc9fbb91c8c14c0ad8cd7f91e465f28837be9b58f02e0921b4107f7ac5a1a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1803.09805",
    "kind": "arxiv",
    "version": 1
  }
}