Pith Number

pith:RBJW5DHC

pith:2013:RBJW5DHCTZ3AVU2KH5OUEPROQO

not attested not anchored not stored refs pending

A novel variability-based method for quasar selection: evidence for a rest frame ~54 day characteristic timescale

Andrew J. Drake, Ashish A. Mahabal, Ciro Donalek, Daniel Stern, Eilat Glikman, Matthew J. Graham, Melissa Chang, S.G. Djorgovski

arxiv:1401.1785 v1 · 2013-12-31 · 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{RBJW5DHCTZ3AVU2KH5OUEPROQO}

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	2026-05-18T02:57:16.823748Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

88536e8ce29e760ad34a3f5d423e2e83acde8bc2fc275577edb807384713ebca

Aliases

arxiv: 1401.1785 · arxiv_version: 1401.1785v1 · doi: 10.48550/arxiv.1401.1785 · pith_short_12: RBJW5DHCTZ3A · pith_short_16: RBJW5DHCTZ3AVU2K · pith_short_8: RBJW5DHC

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/RBJW5DHCTZ3AVU2KH5OUEPROQO \
  | 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: 88536e8ce29e760ad34a3f5d423e2e83acde8bc2fc275577edb807384713ebca

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "de0a71a49f9449c2452320da16dd8d7f3f6c0a2f32172f4ca7882e02a1f5beb3",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2013-12-31T01:38:57Z",
    "title_canon_sha256": "43f33fdf8183d277cf41cae47c31c595ea47ce766f5dc4f04b3f43bd3bcf957a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1401.1785",
    "kind": "arxiv",
    "version": 1
  }
}