Pith Number

pith:BGZHYJTC

pith:2019:BGZHYJTCHFPSZQWFP6GIPAAVQX

not attested not anchored not stored refs pending

Optimal reduced model algorithms for data-based state estimation

Albert Cohen, Jalal Fadili, James Nichols, Olga Mula, Ron DeVore, Wolfgang Dahmen

arxiv:1903.07938 v2 · 2019-03-19 · math.NA · 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{BGZHYJTCHFPSZQWFP6GIPAAVQX}

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	2026-07-05T01:23:53.775007Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

09b27c2662395f2cc2c57f8c87801585de8c3df0913acdb48f3c9f528693c017

Aliases

arxiv: 1903.07938 · arxiv_version: 1903.07938v2 · doi: 10.48550/arxiv.1903.07938 · pith_short_12: BGZHYJTCHFPS · pith_short_16: BGZHYJTCHFPSZQWF · pith_short_8: BGZHYJTC

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/BGZHYJTCHFPSZQWFP6GIPAAVQX \
  | 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: 09b27c2662395f2cc2c57f8c87801585de8c3df0913acdb48f3c9f528693c017

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cdb4115d2c8d311abd8a22e2b39bde040911be755a2a1b8da32d470e7075c8fb",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://creativecommons.org/licenses/by-sa/4.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2019-03-19T11:10:35Z",
    "title_canon_sha256": "d333c9515cb35859e8667c0ecb776e4e901f96100125382ecf77a136cd779208"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1903.07938",
    "kind": "arxiv",
    "version": 2
  }
}