Pith Number

pith:O7KF4X7U

pith:2011:O7KF4X7UI3AA2UC3MAMIMIJNXU

not attested not anchored not stored refs pending

VLBI imaging of M81* at 43GHz

E. Ros (U. Valencia, M.A. Perez-Torres (IAA-CSIC), Mpifr)

arxiv:1111.4856 v1 · 2011-11-21 · 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{O7KF4X7UI3AA2UC3MAMIMIJNXU}

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	2026-05-18T01:59:27.545991Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

77d45e5ff446c00d505b601886212dbd0b2ffe3a6740aa4165c0804da0581893

Aliases

arxiv: 1111.4856 · arxiv_version: 1111.4856v1 · doi: 10.48550/arxiv.1111.4856 · pith_short_12: O7KF4X7UI3AA · pith_short_16: O7KF4X7UI3AA2UC3 · pith_short_8: O7KF4X7U

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/O7KF4X7UI3AA2UC3MAMIMIJNXU \
  | 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: 77d45e5ff446c00d505b601886212dbd0b2ffe3a6740aa4165c0804da0581893

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fe0eec710bba2e47902d1970bcbc7ffed0d94beb7b5a43082e6a1b1ec907704a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2011-11-21T13:01:11Z",
    "title_canon_sha256": "f39e5d83e5f150837223ce9f800e5409b218d3d4b1fd9d400b6c15ecfe409bb9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1111.4856",
    "kind": "arxiv",
    "version": 1
  }
}