Pith Number

pith:KR7E5FVD

pith:2009:KR7E5FVDJCFUCXNVVX2EZ3WSVX

not attested not anchored not stored refs pending

A Candidate Sub-Parsec Supermassive Binary Black Hole System

Todd A. Boroson (NOAO), Tod R. Lauer (NOAO)

arxiv:0901.3779 v1 · 2009-01-23 · 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{KR7E5FVDJCFUCXNVVX2EZ3WSVX}

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	2026-07-04T17:14:17.536851Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

547e4e96a3488b415db5adf44ceed2adfe07d339abd241d7e609ad6e3d35a764

Aliases

arxiv: 0901.3779 · arxiv_version: 0901.3779v1 · doi: 10.48550/arxiv.0901.3779 · pith_short_12: KR7E5FVDJCFU · pith_short_16: KR7E5FVDJCFUCXNV · pith_short_8: KR7E5FVD

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/KR7E5FVDJCFUCXNVVX2EZ3WSVX \
  | 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: 547e4e96a3488b415db5adf44ceed2adfe07d339abd241d7e609ad6e3d35a764

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8a33db5218befa43aba11362110af9f7c1319f075f01ef17ee3925cbbf238eb2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-01-23T21:21:56Z",
    "title_canon_sha256": "22b0caaad76c3e74cace50290e53be331f4d14965151c36fe91c995e667e544f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0901.3779",
    "kind": "arxiv",
    "version": 1
  }
}