Pith Number

pith:SGJHLLSF

pith:2017:SGJHLLSFRW62AACGPHEKM4ZPYU

not attested not anchored not stored refs pending

Periodicity in the continua and broad line curves of a quasar E1821+643

Alla I. Shapovalova, Andjelka Kovacevic, Dragana Ilic, Luka C. Popovic

arxiv:1701.01566 v1 · 2017-01-06 · astro-ph.GA · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SGJHLLSFRW62AACGPHEKM4ZPYU}

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	2026-05-18T00:51:12.003343Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

919275ae458dbda0004679c8a6732fc53eb59964caab9e7dcee94ede7229c743

Aliases

arxiv: 1701.01566 · arxiv_version: 1701.01566v1 · doi: 10.48550/arxiv.1701.01566 · pith_short_12: SGJHLLSFRW62 · pith_short_16: SGJHLLSFRW62AACG · pith_short_8: SGJHLLSF

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/SGJHLLSFRW62AACGPHEKM4ZPYU \
  | 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: 919275ae458dbda0004679c8a6732fc53eb59964caab9e7dcee94ede7229c743

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "43a2194e9bf7d21a2046adb8e5d13ae9b7e4d094ed3985ca6d6797c9e9e618c8",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2017-01-06T08:20:18Z",
    "title_canon_sha256": "8ef7984f17d93ebf975be1afec031cedf8893d6d4e95cfa40bd2bc83d1cafff6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1701.01566",
    "kind": "arxiv",
    "version": 1
  }
}