Pith Number

pith:3Q4HR3IP

pith:2009:3Q4HR3IP6TTFONVPBOBF7RAITP

not attested not anchored not stored refs pending

The Hubble sequence: just a vestige of merger events?

((1) GEPI Observatoire de Paris Meudon (2) LAM Observatoire Astronomique de Marseille), E. Athanassoula (2), F. Hammer (1), H. Flores (1), M. Puech (1), M. Rodrigues (1), R. Delgado-Serrano (1), Y. Yang (1)

arxiv:0903.3962 v4 · 2009-03-23 · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{3Q4HR3IP6TTFONVPBOBF7RAITP}

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	2026-05-18T02:14:26.396237Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

dc3878ed0ff4e65736af0b825fc4089bcf58c3cdbf1e47f15612fca6aa89155a

Aliases

arxiv: 0903.3962 · arxiv_version: 0903.3962v4 · doi: 10.48550/arxiv.0903.3962 · pith_short_12: 3Q4HR3IP6TTF · pith_short_16: 3Q4HR3IP6TTFONVP · pith_short_8: 3Q4HR3IP

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/3Q4HR3IP6TTFONVPBOBF7RAITP \
  | 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: dc3878ed0ff4e65736af0b825fc4089bcf58c3cdbf1e47f15612fca6aa89155a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d724fbf686a9345e9979e7d50f7e37d878e2dd1ae3a53c9bb0e277e4a1fb0ec0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-03-23T21:02:09Z",
    "title_canon_sha256": "ce14469b5ac50c4b6aa471bd50f393306d369f643b27c6d6f70efcb76c0da7e7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.3962",
    "kind": "arxiv",
    "version": 4
  }
}