Pith Number

pith:2CBV3W2C

pith:2011:2CBV3W2CMDFFX3IT2QEY3XG43K

not attested not anchored not stored refs pending

The Ionization Fraction in the DM Tau Protoplanetary Disk

Chunhua Qi, David J. Wilner, Karin I. Oberg, Sean M. Andrews

arxiv:1109.2578 v1 · 2011-09-12 · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2CBV3W2CMDFFX3IT2QEY3XG43K}

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	2026-05-18T02:00:34.151656Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d0835ddb4260ca5bed13d4098ddcdcdaa80b93d82cea2bb26434e082ffed3f3f

Aliases

arxiv: 1109.2578 · arxiv_version: 1109.2578v1 · doi: 10.48550/arxiv.1109.2578 · pith_short_12: 2CBV3W2CMDFF · pith_short_16: 2CBV3W2CMDFFX3IT · pith_short_8: 2CBV3W2C

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/2CBV3W2CMDFFX3IT2QEY3XG43K \
  | 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: d0835ddb4260ca5bed13d4098ddcdcdaa80b93d82cea2bb26434e082ffed3f3f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c7f8f02c7cbe61e695f01bef03b1391018665ddce407ecaecddef487cadd50e1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2011-09-12T19:40:29Z",
    "title_canon_sha256": "1c3541d46849bcc7c6f993df0564c173cb81a02ddf8be3fe69b68e5245bc9637"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1109.2578",
    "kind": "arxiv",
    "version": 1
  }
}