Pith Number

pith:YE3BO23G

pith:2009:YE3BO23GOYLJXHZILQ2G3G6L7Q

not attested not anchored not stored refs pending

Measuring the spin of the primary black hole in OJ287

A. Gopakumar, D. Merritt, H. J. Lehto, H. Rampadarath, M. Basta, M. J.Valtonen, R. Hudec, R. Saunders, S. Mikkola, T. Hyv\"onen

arxiv:0912.1209 v1 · 2009-12-07 · astro-ph.HE · 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{YE3BO23GOYLJXHZILQ2G3G6L7Q}

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	2026-05-18T02:33:57.358366Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c136176b6676169b9f285c346d9bcbfc2f3bb1861b677f14c3f9e20f079254b2

Aliases

arxiv: 0912.1209 · arxiv_version: 0912.1209v1 · doi: 10.48550/arxiv.0912.1209 · pith_short_12: YE3BO23GOYLJ · pith_short_16: YE3BO23GOYLJXHZI · pith_short_8: YE3BO23G

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/YE3BO23GOYLJXHZILQ2G3G6L7Q \
  | 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: c136176b6676169b9f285c346d9bcbfc2f3bb1861b677f14c3f9e20f079254b2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "db7112ed63629aeb5d8d8cf3da339362a95c444ddac629022b4fc7ac6238d254",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2009-12-07T11:36:43Z",
    "title_canon_sha256": "544b6feeacc2f2a4d79b7a5eaf34f034246b5a1eb76a80c949d114106eeb9cc8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0912.1209",
    "kind": "arxiv",
    "version": 1
  }
}