Pith Number

pith:CCZXRN6F

pith:2018:CCZXRN6FSHKGGJHHZTMWNYL6KK

not attested not anchored not stored refs pending

A New Approach for 4DVar Data Assimilation

Aiguo Dai, Hongqin Zhang, Lu Zhang, Rui Han, Xiangjun Tian, Xiaobing Feng

arxiv:1805.09320 v2 · 2018-05-23 · physics.data-an

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{CCZXRN6FSHKGGJHHZTMWNYL6KK}

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	2026-05-18T00:14:59.079996Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

10b378b7c591d46324e7ccd966e17e52b3c8b28d11ddb3f0582826cf4214b4ac

Aliases

arxiv: 1805.09320 · arxiv_version: 1805.09320v2 · doi: 10.48550/arxiv.1805.09320 · pith_short_12: CCZXRN6FSHKG · pith_short_16: CCZXRN6FSHKGGJHH · pith_short_8: CCZXRN6F

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/CCZXRN6FSHKGGJHHZTMWNYL6KK \
  | 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: 10b378b7c591d46324e7ccd966e17e52b3c8b28d11ddb3f0582826cf4214b4ac

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8802ae5cb6568af45c905e1f37818d34522ce6c26dc6b96118066ce612901383",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.data-an",
    "submitted_at": "2018-05-23T08:20:29Z",
    "title_canon_sha256": "dddb2b143786c3fccdf96a5f9ebbc8d936f25715bb3c51dd1425f57324555941"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1805.09320",
    "kind": "arxiv",
    "version": 2
  }
}