Pith Number

pith:KK5ZIIJP

pith:2014:KK5ZIIJP27JBALKPJG4FFSK52R

not attested not anchored not stored refs pending

A Derivative-Free Trust Region Framework for Variational Data Assimilation

Adrian Sandu, Elias D. Nino

arxiv:1403.7692 v2 · 2014-03-30 · cs.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{KK5ZIIJP27JBALKPJG4FFSK52R}

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	2026-05-18T02:28:11.979306Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

52bb94212fd7d2102d4f49b852c95dd44a1d688b6892eecb52c8747271dac7cd

Aliases

arxiv: 1403.7692 · arxiv_version: 1403.7692v2 · doi: 10.48550/arxiv.1403.7692 · pith_short_12: KK5ZIIJP27JB · pith_short_16: KK5ZIIJP27JBALKP · pith_short_8: KK5ZIIJP

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/KK5ZIIJP27JBALKPJG4FFSK52R \
  | 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: 52bb94212fd7d2102d4f49b852c95dd44a1d688b6892eecb52c8747271dac7cd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a610fa665c7c346158f267278013a04b54276fb8c3fceb5370f67306c3eaffc9",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.NA",
    "submitted_at": "2014-03-30T02:24:49Z",
    "title_canon_sha256": "8761f4bce1ed01ab0a57eec0ab76461497c23f494710b360931a8ef5ce5172e8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1403.7692",
    "kind": "arxiv",
    "version": 2
  }
}