Pith Number

pith:YXOWRHJ4

pith:1999:YXOWRHJ46W6K26QC7RP3TTUR7T

not attested not anchored not stored refs pending

On the Relationship between Galaxy Formation and Quasar Evolution

Alberto Franceschini, Diego Malquori, Guenther Hasinger, Takamitsu Miyaji

arxiv:astro-ph/9909290 v1 · 1999-09-16 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{YXOWRHJ46W6K26QC7RP3TTUR7T}

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	2026-07-04T16:11:37.194378Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c5dd689d3cf5bcad7a02fc5fb9ce91fce52c802ac422aa780f984ea5adb69df9

Aliases

arxiv: astro-ph/9909290 · arxiv_version: astro-ph/9909290v1 · doi: 10.48550/arxiv.astro-ph/9909290 · pith_short_12: YXOWRHJ46W6K · pith_short_16: YXOWRHJ46W6K26QC · pith_short_8: YXOWRHJ4

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/YXOWRHJ46W6K26QC7RP3TTUR7T \
  | 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: c5dd689d3cf5bcad7a02fc5fb9ce91fce52c802ac422aa780f984ea5adb69df9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6c4ce9e334b42053ec21ba5d3f89b444df122409f7152f6677e0aba285a5d7d3",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-09-16T13:45:22Z",
    "title_canon_sha256": "ebc1cf2076b30ac0ec4e8b31ce5b691260998c6d87d7c8cfc8ec407d46b18e39"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9909290",
    "kind": "arxiv",
    "version": 1
  }
}