Pith Number

pith:WUDAVUGY

pith:2014:WUDAVUGYBWH2N3YQFWM5PMDPXK

not attested not anchored not stored refs pending

On Practical Regular Expressions

Holger Petersen

arxiv:1408.1258 v2 · 2014-08-06 · cs.FL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{WUDAVUGYBWH2N3YQFWM5PMDPXK}

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	2026-05-18T02:30:08.051805Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b5060ad0d80d8fa6ef102d99d7b06fbaabea950774d2c2ffde961fcbd6d96ceb

Aliases

arxiv: 1408.1258 · arxiv_version: 1408.1258v2 · doi: 10.48550/arxiv.1408.1258 · pith_short_12: WUDAVUGYBWH2 · pith_short_16: WUDAVUGYBWH2N3YQ · pith_short_8: WUDAVUGY

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/WUDAVUGYBWH2N3YQFWM5PMDPXK \
  | 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: b5060ad0d80d8fa6ef102d99d7b06fbaabea950774d2c2ffde961fcbd6d96ceb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "735795ff2b9997bcd69c3f06c8728b2fee9eb493411746a4d3c2bc5bd841648f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2014-08-06T12:30:09Z",
    "title_canon_sha256": "83d4d552e2c21f0cd2f17d192051baba3ceadf75de0893c3f368bc89654808ce"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1408.1258",
    "kind": "arxiv",
    "version": 2
  }
}