Pith Number

pith:3UH64K6Z

pith:2019:3UH64K6ZTEX7SFOKA64QRNRGPH

not attested not anchored not stored refs pending

The X-ray properties of $z>6$ quasars: no evident evolution of accretion physics in the first Gyr of the Universe

Andrea Comastri, Bin Luo, Cristian Vignali, Fabio Vito, Francesca Civano, Francesco Calura, Franz Erik Bauer, Gianni Zamorani, Marcella Brusa, Ohad Shemmer, Riccardo Nanni, Roberto Gilli, William Nielsen Brandt

arxiv:1908.09849 v1 · 2019-08-26 · 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{3UH64K6ZTEX7SFOKA64QRNRGPH}

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.

Cited by

1 paper in Pith

Deep Learning Calibration of the Quasar X-ray/UV Luminosity Relation for Cosmological Applications

Receipt and verification

First computed	2026-07-05T00:09:03.777340Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

dd0fee2bd9992ff915ca07b908b62679d0e4721410e56977666bf29f040186d0

Aliases

arxiv: 1908.09849 · arxiv_version: 1908.09849v1 · doi: 10.48550/arxiv.1908.09849 · pith_short_12: 3UH64K6ZTEX7 · pith_short_16: 3UH64K6ZTEX7SFOK · pith_short_8: 3UH64K6Z

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/3UH64K6ZTEX7SFOKA64QRNRGPH \
  | 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: dd0fee2bd9992ff915ca07b908b62679d0e4721410e56977666bf29f040186d0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7c54bf171e642f184e67e8091841ee56f55ba244caf6a6920139f5c6e5cfb378",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2019-08-26T18:00:06Z",
    "title_canon_sha256": "7a1190e4d769f6f61f10d4ed772fd68c5e9ca332fd3bc98de44d2e5f192e9730"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.09849",
    "kind": "arxiv",
    "version": 1
  }
}