Pith Number

pith:YCZKCY7U

pith:2017:YCZKCY7U7WPNU5JTMJ33J5VQGK

not attested not anchored not stored refs pending

A Hubble diagram for quasars

Elisabeta Lusso, Guido Risaliti, Susanna Bisogni

arxiv:1712.07515 v1 · 2017-12-20 · astro-ph.GA · 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{YCZKCY7U7WPNU5JTMJ33J5VQGK}

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	2026-05-18T00:27:34.332806Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c0b2a163f4fd9eda75336277b4f6b032889b6f8d165c4eb3b511f5fd93c48201

Aliases

arxiv: 1712.07515 · arxiv_version: 1712.07515v1 · doi: 10.48550/arxiv.1712.07515 · pith_short_12: YCZKCY7U7WPN · pith_short_16: YCZKCY7U7WPNU5JT · pith_short_8: YCZKCY7U

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/YCZKCY7U7WPNU5JTMJ33J5VQGK \
  | 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: c0b2a163f4fd9eda75336277b4f6b032889b6f8d165c4eb3b511f5fd93c48201

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "28aaf3bf74ee5f135a2d69864f4d34a5896abd6e8b03ebdd44a537e84aaba96c",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2017-12-20T15:08:40Z",
    "title_canon_sha256": "3eeb662443541ec24a73c3cd777c7d6516c14c62ad477d346b68323265ecbb12"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1712.07515",
    "kind": "arxiv",
    "version": 1
  }
}