Pith Number

pith:W2APMQKZ

pith:2001:W2APMQKZV6BN23BYZD4J3OOQWC

not attested not anchored not stored refs pending

Optical and radio variability of the BL Lac object AO 0235+16: a possible 5-6 year periodicity

A.C. Sadun, A. Heines, A. Pati, A. Sillanpaa, C. Heisler, C.M. Raiteri, E.J. McGrath, E. Massaro, F. Montagni, G. Tosti, H.D. Aller, H. Terasranta, J. Heidt, J. Hu, J.R. Mattox, J. Wei, K. Nilsson, L. Lanteri, L. Ostorero, L.O. Takalo, M.F. Aller, M. Feldt, M.G. Nikolashvili, M. Kidger, M. Maesano, M. Villata, O.M. Kurtanidze, P. Nurmi, P. Shastri, R. Nesci, R. Rekola, R. Robb, S.J. Wagner, T.J. Balonek, T. Pursimo, X. Wu

arxiv:astro-ph/0108165 v1 · 2001-08-09 · astro-ph

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{W2APMQKZV6BN23BYZD4J3OOQWC}

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	2026-07-04T16:23:56.527432Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b680f64159af82dd6c38c8f89db9d0b0a30bca9174d7984d1f3c8128c5016242

Aliases

arxiv: astro-ph/0108165 · arxiv_version: astro-ph/0108165v1 · doi: 10.48550/arxiv.astro-ph/0108165 · pith_short_12: W2APMQKZV6BN · pith_short_16: W2APMQKZV6BN23BY · pith_short_8: W2APMQKZ

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/W2APMQKZV6BN23BYZD4J3OOQWC \
  | 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: b680f64159af82dd6c38c8f89db9d0b0a30bca9174d7984d1f3c8128c5016242

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9202d47ab9085bb47169224db3f4f007e39d127513c1e72e5706179f1d5f9b27",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2001-08-09T14:43:47Z",
    "title_canon_sha256": "847092e6b7ef6eb4b93af933480d62c82273d458e0be6109c0be3797b17bbe17"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0108165",
    "kind": "arxiv",
    "version": 1
  }
}