Pith Number

pith:2USN345J

pith:2015:2USN345JQJ2PBZ6PEQOW6TVKTI

not attested not anchored not stored refs pending

Neutral atomic-carbon QSO absorption-line systems at z>1.5: Sample selection, HI content, reddening, and 2175 A extinction feature

C. Ledoux, P. Noterdaeme, P. Petitjean, R. Srianand

arxiv:1504.07254 v1 · 2015-04-27 · 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{2USN345JQJ2PBZ6PEQOW6TVKTI}

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	2026-05-18T01:36:33.469478Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d524ddf3a98274f0e7cf241d6f4eaa9a28b5823183f15b9133c40a9d0225becd

Aliases

arxiv: 1504.07254 · arxiv_version: 1504.07254v1 · doi: 10.48550/arxiv.1504.07254 · pith_short_12: 2USN345JQJ2P · pith_short_16: 2USN345JQJ2PBZ6P · pith_short_8: 2USN345J

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/2USN345JQJ2PBZ6PEQOW6TVKTI \
  | 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: d524ddf3a98274f0e7cf241d6f4eaa9a28b5823183f15b9133c40a9d0225becd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "651906074d37b3a205cbc3ba17106946253cac553202741b463e21347df87ad8",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2015-04-27T20:03:57Z",
    "title_canon_sha256": "2bedf47940493b3e5855b26aa81471089b14cad976d6c2853b700b0ccda4258c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1504.07254",
    "kind": "arxiv",
    "version": 1
  }
}