Pith Number

pith:3EPOF3LO

pith:2019:3EPOF3LOC6KWZ22ZBCFU3PDCUX

not attested not anchored not stored refs pending

Constraining a black hole companion for M87* through imaging by the Event Horizon Telescope

Abraham Loeb, Mark Reid, Mohammadtaher Safarzadeh

arxiv:1905.06835 v2 · 2019-05-16 · astro-ph.GA · astro-ph.HE · hep-th

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{3EPOF3LOC6KWZ22ZBCFU3PDCUX}

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	2026-05-17T23:40:31.975102Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d91ee2ed6e17956ceb59088b4dbc62a5efc98125cb01ba936c95fd723cb50208

Aliases

arxiv: 1905.06835 · arxiv_version: 1905.06835v2 · doi: 10.48550/arxiv.1905.06835 · pith_short_12: 3EPOF3LOC6KW · pith_short_16: 3EPOF3LOC6KWZ22Z · pith_short_8: 3EPOF3LO

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/3EPOF3LOC6KWZ22ZBCFU3PDCUX \
  | 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: d91ee2ed6e17956ceb59088b4dbc62a5efc98125cb01ba936c95fd723cb50208

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9aa08159cc4149c04813c356d3cab5d9c610304fcd93c913a891690b7e3f210d",
    "cross_cats_sorted": [
      "astro-ph.HE",
      "hep-th"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2019-05-16T15:20:47Z",
    "title_canon_sha256": "2e163a35a7a002bbc87856d32427fba96e851c23b1809272686bc6fc759875cd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1905.06835",
    "kind": "arxiv",
    "version": 2
  }
}