Pith Number

pith:4S43CFLY

pith:2009:4S43CFLYIEHOURFPW3BLVRREVT

not attested not anchored not stored refs pending

The early evolution of massive black holes

Marta Volonteri

arxiv:0912.0525 v1 · 2009-12-02 · 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{4S43CFLYIEHOURFPW3BLVRREVT}

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	2026-05-18T02:10:34.454422Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e4b9b11578410eea44afb6c2bac624acece7ffdc07360f6b3f5727fe1b4d8ff9

Aliases

arxiv: 0912.0525 · arxiv_version: 0912.0525v1 · doi: 10.48550/arxiv.0912.0525 · pith_short_12: 4S43CFLYIEHO · pith_short_16: 4S43CFLYIEHOURFP · pith_short_8: 4S43CFLY

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/4S43CFLYIEHOURFPW3BLVRREVT \
  | 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: e4b9b11578410eea44afb6c2bac624acece7ffdc07360f6b3f5727fe1b4d8ff9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "56bd34961991b252c99d15973f28a115c221016164a71cae5658a1196a044e81",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-12-02T21:09:23Z",
    "title_canon_sha256": "bbbcb0849409e7befcdda3d3161ff691ef3812bf1d7b44155af50aabb0730dc3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0912.0525",
    "kind": "arxiv",
    "version": 1
  }
}