Pith Number

pith:NU456RHN

pith:2015:NU456RHNDKELRL6AX2CK63J7HK

not attested not anchored not stored refs pending

SDSS J1138+3517: A quasar showing remarkably variable broad absorption lines

Conor Wildy, James T. Allen, Michael R. Goad

arxiv:1501.04975 v2 · 2015-01-20 · astro-ph.GA · 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{NU456RHNDKELRL6AX2CK63J7HK}

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	2026-05-18T02:25:55.570328Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6d39df44ed1a88b8afc0be84af6d3f3a8eb3c1c52c923fce455a9a2437c229a9

Aliases

arxiv: 1501.04975 · arxiv_version: 1501.04975v2 · doi: 10.48550/arxiv.1501.04975 · pith_short_12: NU456RHNDKEL · pith_short_16: NU456RHNDKELRL6A · pith_short_8: NU456RHN

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/NU456RHNDKELRL6AX2CK63J7HK \
  | 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: 6d39df44ed1a88b8afc0be84af6d3f3a8eb3c1c52c923fce455a9a2437c229a9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0b69dfadb9432a06d47c84da32b3e655ad277fc6d1f6f69bffa277bfaf9235cb",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2015-01-20T21:14:01Z",
    "title_canon_sha256": "6aee320fdfdc835376c0d532e2a0e655cd5ad9e97f74e15c30c5ab909f2cb818"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1501.04975",
    "kind": "arxiv",
    "version": 2
  }
}