Pith Number

pith:XBUDHPHM

pith:2019:XBUDHPHMOCB6GI4TAUWOF4L2UW

not attested not anchored not stored refs pending

Studying black holes on horizon scales with space-VLBI

Akihiro Doi David J. James, Alexander Raymond, Daniel C. M. Palumbo, Daniel P. Marrone, Dominic W. Pesce, Don Boroson, Garrett K. Keating, Gopal Narayanan, Hiroshi Nagai, Jens Kauffmann, Jonathan Weintroub, Jose L. Gomez, Joseph R. Farah, Kari Haworth, Katherine L. Bouman, Kazunori Akiyama, Laurent Loinard, Lindy Blackburn, Maciek Wielgus, Mareki Honma, Mark Silver, Michael D. Johnson, Motoki Kino, Sheperd S. Doeleman, Thomas P. Krichbaum, Tomohisa Kawashima, Vincent L. Fish, Yosuke Mizuno

arxiv:1909.01405 v1 · 2019-09-03 · astro-ph.IM · 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{XBUDHPHMOCB6GI4TAUWOF4L2UW}

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	2026-07-05T00:02:15.990577Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b86833bcec7083e32393052ce2f17aa58362928a74addda7d0b21997e06060c7

Aliases

arxiv: 1909.01405 · arxiv_version: 1909.01405v1 · doi: 10.48550/arxiv.1909.01405 · pith_short_12: XBUDHPHMOCB6 · pith_short_16: XBUDHPHMOCB6GI4T · pith_short_8: XBUDHPHM

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/XBUDHPHMOCB6GI4TAUWOF4L2UW \
  | 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: b86833bcec7083e32393052ce2f17aa58362928a74addda7d0b21997e06060c7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1b473326a97183b5f9279e5942e8e23ea6959078b2d13a1d5681593ec5b66f87",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2019-09-03T19:06:40Z",
    "title_canon_sha256": "f0e82c85a846ad103a047e78b2b7b9ef801a05030415a4f2d03128325bf09c67"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1909.01405",
    "kind": "arxiv",
    "version": 1
  }
}