Pith Number

pith:T7W5LJPV

pith:2026:T7W5LJPVJTPNAORKOLV4NLWUPG

not attested not anchored not stored refs pending

Classifying Quasar Types Without a Spectrum

Adrien H\'elias, Matthew J. Graham, Pauline Barmby, Sarah C. Gallagher, Shahram Abbassi

arxiv:2608.11916 v1 · 2026-08-12 · 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{T7W5LJPVJTPNAORKOLV4NLWUPG}

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	2026-08-13T01:28:54.660304Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9fedd5a5f54cded03a2a72ebc6aed479a3bc77e6c12e12275e44786ecfe5dac3

Aliases

arxiv: 2608.11916 · arxiv_version: 2608.11916v1 · doi: 10.48550/arxiv.2608.11916 · pith_short_12: T7W5LJPVJTPN · pith_short_16: T7W5LJPVJTPNAORK · pith_short_8: T7W5LJPV

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/T7W5LJPVJTPNAORKOLV4NLWUPG \
  | 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: 9fedd5a5f54cded03a2a72ebc6aed479a3bc77e6c12e12275e44786ecfe5dac3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "76891763bff88dc73c6acc2bcf01ef5c932ce2d1e35eb3dd30d9507c65bd6d99",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-sa/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-08-12T10:49:51Z",
    "title_canon_sha256": "354c86dc6d9101e367ec6b4cc9aa892d42de0342a79fc10d111b043a158aa770"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2608.11916",
    "kind": "arxiv",
    "version": 1
  }
}