Pith Number

pith:75R4RA6L

pith:2018:75R4RA6LYR2PTK73YT5ZP5L75V

not attested not anchored not stored refs pending

The Black Hole Masses and Eddington Ratios of Type 2 Quasars

(2) Kavli Institute for Astronomy, 3) ((1) Department of Physics, (3) Department of Astronomy, Astrophysics, Hebei Normal University, Luis C. Ho (2, Minzhi Kong (1), Peking University, Peking University), School of Physics

arxiv:1804.09852 v1 · 2018-04-26 · 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{75R4RA6LYR2PTK73YT5ZP5L75V}

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	2026-05-18T00:13:25.986549Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ff63c883cbc474f9abfbc4fb97f57fed45f73356f1445a0800c28b6a8bbfd26e

Aliases

arxiv: 1804.09852 · arxiv_version: 1804.09852v1 · doi: 10.48550/arxiv.1804.09852 · pith_short_12: 75R4RA6LYR2P · pith_short_16: 75R4RA6LYR2PTK73 · pith_short_8: 75R4RA6L

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/75R4RA6LYR2PTK73YT5ZP5L75V \
  | 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: ff63c883cbc474f9abfbc4fb97f57fed45f73356f1445a0800c28b6a8bbfd26e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0c1ee08533143fe00a7698dce20d0270762037184e148802d3cd76c1528dd579",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2018-04-26T01:47:10Z",
    "title_canon_sha256": "5c3189be2777b924207a2a06694d2add73e75ba9bfe5cac0eb7ce2a7fb564961"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.09852",
    "kind": "arxiv",
    "version": 1
  }
}