Pith Number

pith:4HD65WAR

pith:2019:4HD65WARW5OI6WWUNQL66LHORU

not attested not anchored not stored refs pending

Exploring Active Supermassive Black Holes at 100 Micro-arcsecond Resolution

Douglas Gies, John Monnier, Makoto Kishimoto, Martin Elvis, Michelle Creech-Eakman, Robert Antonucci, Sebastian Hoenig, Stephen Ridgway, Theo ten Brummelaar

arxiv:1903.09356 v1 · 2019-03-22 · 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{4HD65WARW5OI6WWUNQL66LHORU}

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	2026-05-17T23:50:39.856762Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e1c7eed811b75c8f5ad46c17ef2cee8d17892519632d93f22118f9178fa66138

Aliases

arxiv: 1903.09356 · arxiv_version: 1903.09356v1 · doi: 10.48550/arxiv.1903.09356 · pith_short_12: 4HD65WARW5OI · pith_short_16: 4HD65WARW5OI6WWU · pith_short_8: 4HD65WAR

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/4HD65WARW5OI6WWUNQL66LHORU \
  | 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: e1c7eed811b75c8f5ad46c17ef2cee8d17892519632d93f22118f9178fa66138

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b71cc1ad88e907f3b11f99a430a9ab8f6c76dd3cca099d8428226117aa69d95e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2019-03-22T04:50:37Z",
    "title_canon_sha256": "ca3429510899d201e240fda1b6b7220e48179e947e8df05fc31300bcf1615494"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1903.09356",
    "kind": "arxiv",
    "version": 1
  }
}