Pith Number

pith:DBU4PORO

pith:2017:DBU4POROBQBOGHNRFKK7EBW2K7

not attested not anchored not stored refs pending

Physical properties of the first quasars

Fabio Pacucci, Roberto Maiolino, Simona Gallerani, Xiaohui Fan

arxiv:1702.06123 v2 · 2017-02-20 · astro-ph.GA · astro-ph.CO · astro-ph.HE

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DBU4POROBQBOGHNRFKK7EBW2K7}

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	2026-05-18T00:43:54.366246Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1869c7ba2e0c02e31db12a95f206da57ca43cdbd39c2ebe15fc5333cf288a055

Aliases

arxiv: 1702.06123 · arxiv_version: 1702.06123v2 · doi: 10.48550/arxiv.1702.06123 · pith_short_12: DBU4POROBQBO · pith_short_16: DBU4POROBQBOGHNR · pith_short_8: DBU4PORO

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/DBU4POROBQBOGHNRFKK7EBW2K7 \
  | 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: 1869c7ba2e0c02e31db12a95f206da57ca43cdbd39c2ebe15fc5333cf288a055

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "05ec3360f686898c668c713952e7aac8d08b4fb905a31b0e54499d78b39be4ca",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2017-02-20T19:00:00Z",
    "title_canon_sha256": "01a0b692dfe72664e7d063c582e2517b665e6324e93111ca72dfa03e987187ec"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1702.06123",
    "kind": "arxiv",
    "version": 2
  }
}