Pith Number

pith:Y5OE53P3

pith:2013:Y5OE53P3OU3K3KH3DPXV4OEMQL

not attested not anchored not stored refs pending

Kepler observations of rapid optical variability in the BL Lac object W2R1926+42

J. Scargle, M. Malkan, P. Gandhi, R. Edelson, R. Mushotzky, S. Vaughan, W. Baumgartner

arxiv:1302.4445 v1 · 2013-02-18 · astro-ph.HE · astro-ph.CO

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

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	2026-05-18T02:43:26.400701Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c75c4eedfb7536ada8fb1bef5e388c82d55a88d1278fc30cd709ba45e37061fe

Aliases

arxiv: 1302.4445 · arxiv_version: 1302.4445v1 · doi: 10.48550/arxiv.1302.4445 · pith_short_12: Y5OE53P3OU3K · pith_short_16: Y5OE53P3OU3K3KH3 · pith_short_8: Y5OE53P3

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/Y5OE53P3OU3K3KH3DPXV4OEMQL \
  | 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: c75c4eedfb7536ada8fb1bef5e388c82d55a88d1278fc30cd709ba45e37061fe

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9cc18bfc5c5c88a85abbabb406331f9a80f03843579e1cc5ac087fb558cbc2b4",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2013-02-18T21:00:03Z",
    "title_canon_sha256": "94bb6e056e05894e88d28d00c756eb8f2c058980f566e15a3b7312366cb6cf56"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1302.4445",
    "kind": "arxiv",
    "version": 1
  }
}