Pith Number

pith:QTO4MTAI

pith:2019:QTO4MTAIWUR5KWHK7DRYALEKGA

not attested not anchored not stored refs pending

Understanding extreme quasar optical variability with CRTS: II. Changing-state quasars

Ashish Mahabal, Barry McKernan, Daniel Stern, Eilat Glikman, Eric Christensen, K. E. Saavik Ford, Matthew J. Graham, Nicholas P. Ross, rew J. Drake, S. G. Djorgovski, Steve Larson

arxiv:1905.02262 v1 · 2019-05-06 · 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{QTO4MTAIWUR5KWHK7DRYALEKGA}

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	2026-07-05T00:31:49.604287Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

84ddc64c08b523d558eaf8e3802c8a3024425fc9e4ef06c18d16a99161eec1dd

Aliases

arxiv: 1905.02262 · arxiv_version: 1905.02262v1 · doi: 10.48550/arxiv.1905.02262 · pith_short_12: QTO4MTAIWUR5 · pith_short_16: QTO4MTAIWUR5KWHK · pith_short_8: QTO4MTAI

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/QTO4MTAIWUR5KWHK7DRYALEKGA \
  | 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: 84ddc64c08b523d558eaf8e3802c8a3024425fc9e4ef06c18d16a99161eec1dd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bb7c2c7680d3cac6cf4e53c26536dab310895ccd902e7b13295ff66d7b349153",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2019-05-06T21:07:49Z",
    "title_canon_sha256": "1edbf25806a56e14afaf24c871180855900b48b9ffd13bbec7d70deab10cfce9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1905.02262",
    "kind": "arxiv",
    "version": 1
  }
}