Pith Number

pith:OHOJUFNB

pith:2011:OHOJUFNBZU3TQIV322HZGPWRUS

not attested not anchored not stored refs pending

Controlling overestimation of error covariance in ensemble Kalman filters with sparse observations: A variance limiting Kalman filter

Georg A. Gottwald, Lewis Mitchell, Sebastian Reich

arxiv:1108.5801 v1 · 2011-08-30 · physics.data-an · nlin.CD · physics.ao-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OHOJUFNBZU3TQIV322HZGPWRUS}

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	2026-05-18T04:14:28.588734Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

71dc9a15a1cd373822bbd68f933ed1a4b6b0224aa68161a857fd257e57c225b5

Aliases

arxiv: 1108.5801 · arxiv_version: 1108.5801v1 · doi: 10.48550/arxiv.1108.5801 · pith_short_12: OHOJUFNBZU3T · pith_short_16: OHOJUFNBZU3TQIV3 · pith_short_8: OHOJUFNB

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/OHOJUFNBZU3TQIV322HZGPWRUS \
  | 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: 71dc9a15a1cd373822bbd68f933ed1a4b6b0224aa68161a857fd257e57c225b5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "075c7ae9ac81d45cd85cce24c35c1cd844bdd754c3b33c850070c293577d8147",
    "cross_cats_sorted": [
      "nlin.CD",
      "physics.ao-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.data-an",
    "submitted_at": "2011-08-30T02:34:43Z",
    "title_canon_sha256": "1adadb6c5d21dbbf7e51248dd07b704477e36af8991f5dd4b0ba0fc574d83ff2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1108.5801",
    "kind": "arxiv",
    "version": 1
  }
}