Pith Number

pith:25SPOO5F

pith:2019:25SPOO5FAJDHFCHEJIPHAAHKRN

not attested not anchored not stored refs pending

VLBI imaging of black holes via second moment regularization

A. Chael, H. Falcke, L. Blackburn, M. D. Johnson, M. Mo\'scibrodzka, S. Issaoun

arxiv:1908.01296 v1 · 2019-08-04 · astro-ph.IM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{25SPOO5FAJDHFCHEJIPHAAHKRN}

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	2026-07-05T00:02:09.924030Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d764f73ba502467288e44a1e7000ea8b6d6421f63de69b3a27e2537916f5504a

Aliases

arxiv: 1908.01296 · arxiv_version: 1908.01296v1 · doi: 10.48550/arxiv.1908.01296 · pith_short_12: 25SPOO5FAJDH · pith_short_16: 25SPOO5FAJDHFCHE · pith_short_8: 25SPOO5F

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/25SPOO5FAJDHFCHEJIPHAAHKRN \
  | 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: d764f73ba502467288e44a1e7000ea8b6d6421f63de69b3a27e2537916f5504a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ccdbeaf03d31cda245f9f46bf73e3cff99153b457c6073a736a5742deec92799",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2019-08-04T08:56:08Z",
    "title_canon_sha256": "73623b72ed776c96d944fde38126c5e41bc9608da78ec35e588f948d3346647c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.01296",
    "kind": "arxiv",
    "version": 1
  }
}