Pith Number

pith:4K355ID6

pith:2021:4K355ID6JIOGMR4MXIV7I645XT

not attested not anchored not stored refs pending

The first measurement of the quasar lifetime distribution

Frederick B. Davies, Gabor Worseck, Ilya S. Khrykin, Joseph F. Hennawi

arxiv:2102.04477 v1 · 2021-02-08 · 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{4K355ID6JIOGMR4MXIV7I645XT}

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	2026-07-05T02:39:14.272396Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e2b7dea07e4a1c66478cba2bf47b9dbcca87f8b6cf1153c503eedcfafe046f0b

Aliases

arxiv: 2102.04477 · arxiv_version: 2102.04477v1 · doi: 10.48550/arxiv.2102.04477 · pith_short_12: 4K355ID6JIOG · pith_short_16: 4K355ID6JIOGMR4M · pith_short_8: 4K355ID6

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/4K355ID6JIOGMR4MXIV7I645XT \
  | 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: e2b7dea07e4a1c66478cba2bf47b9dbcca87f8b6cf1153c503eedcfafe046f0b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2274d7f2e2eb7a74390c35c740772ad370975c5d81db6410de1d8aaa7da37543",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2021-02-08T19:00:03Z",
    "title_canon_sha256": "48a992496e6bae15ac07f9f130e0281147504cc715c263f59b92744ffbd61b13"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2102.04477",
    "kind": "arxiv",
    "version": 1
  }
}