Pith Number

pith:5POYYKBB

pith:2019:5POYYKBBX7K5YDZE3E4QB5MWWX

not attested not anchored not stored refs pending

A Parallel Hierarchical Blocked Adaptive Cross Approximation Algorithm

Elizaveta Rebrova, Pieter Ghysels, Wissam Sid-Lakhdar, Xiaoye Sherry Li, Yang Liu

arxiv:1901.06101 v3 · 2019-01-18 · 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{5POYYKBBX7K5YDZE3E4QB5MWWX}

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	2026-07-05T00:02:25.013309Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ebdd8c2821bfd5dc0f24d93900f596b5fb27a6c0d4d0bb5ec8615c58d966d4cb

Aliases

arxiv: 1901.06101 · arxiv_version: 1901.06101v3 · doi: 10.48550/arxiv.1901.06101 · pith_short_12: 5POYYKBBX7K5 · pith_short_16: 5POYYKBBX7K5YDZE · pith_short_8: 5POYYKBB

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/5POYYKBBX7K5YDZE3E4QB5MWWX \
  | 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: ebdd8c2821bfd5dc0f24d93900f596b5fb27a6c0d4d0bb5ec8615c58d966d4cb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ca62511aeb51001165f7e6e354f4efd9c3a2940ec41ab741782cca4e0bfabb63",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2019-01-18T06:39:57Z",
    "title_canon_sha256": "a3e0ff302d3c2756933ab8678ae264e131d528676612ef014849752ddb6bb4f1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1901.06101",
    "kind": "arxiv",
    "version": 3
  }
}