Pith Number

pith:7OU5FZQS

pith:2019:7OU5FZQS7CWHLYXMDALAXIRUXD

not attested not anchored not stored refs pending

Long-term optical spectroscopic variations in blazar 3C 454.3

Alok C. Gupta, Krzysztof Hryniewicz, Krzysztof Nalewajko, Mai Liao, Maitrayee Gupta, Minfeng Gu

arxiv:1909.01357 v2 · 2019-09-03 · astro-ph.HE · 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{7OU5FZQS7CWHLYXMDALAXIRUXD}

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	2026-07-05T01:23:54.932704Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fba9d2e612f8ac75e2ec18160ba234b8f52c000393a012dbdd76074d02f694a3

Aliases

arxiv: 1909.01357 · arxiv_version: 1909.01357v2 · doi: 10.48550/arxiv.1909.01357 · pith_short_12: 7OU5FZQS7CWH · pith_short_16: 7OU5FZQS7CWHLYXM · pith_short_8: 7OU5FZQS

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/7OU5FZQS7CWHLYXMDALAXIRUXD \
  | 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: fba9d2e612f8ac75e2ec18160ba234b8f52c000393a012dbdd76074d02f694a3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4c80600b48e352bc9b8bd9e9ae1335d5d3e2f624d86e7006018ebeb1c6fa0cb8",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2019-09-03T18:00:02Z",
    "title_canon_sha256": "6586ae2ccaaa888656b3732f2901d51a23458e292b9fe2741ad111265618eb8e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1909.01357",
    "kind": "arxiv",
    "version": 2
  }
}