Pith Number

pith:6QCJ2Y4E

pith:2013:6QCJ2Y4EEG43JBY6DCIUT6PTLQ

not attested not anchored not stored refs pending

Jet precession in the active nucleus of M81. Ongoing VLBI monitoring

A. Alberdi, A. Brunthaler, I. Marti-Vidal, J.M. Marcaide

arxiv:1301.4782 v1 · 2013-01-21 · astro-ph.HE · 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{6QCJ2Y4EEG43JBY6DCIUT6PTLQ}

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	2026-05-18T03:35:55.649627Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f4049d638421b9b4871e189149f9f35c22f71b2f8c9187260454c8703b51d747

Aliases

arxiv: 1301.4782 · arxiv_version: 1301.4782v1 · doi: 10.48550/arxiv.1301.4782 · pith_short_12: 6QCJ2Y4EEG43 · pith_short_16: 6QCJ2Y4EEG43JBY6 · pith_short_8: 6QCJ2Y4E

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/6QCJ2Y4EEG43JBY6DCIUT6PTLQ \
  | 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: f4049d638421b9b4871e189149f9f35c22f71b2f8c9187260454c8703b51d747

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6cc2e7b354bc68dbaac9f270de23dd77987bc1197bedba92c22788fc8e384295",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2013-01-21T08:16:07Z",
    "title_canon_sha256": "6f98a8f4b19cd1b9ea2a9722b27d5a333d8f0f37001d368c19114da289eb88f9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1301.4782",
    "kind": "arxiv",
    "version": 1
  }
}