Pith Number

pith:UIX2LV44

pith:2021:UIX2LV44SXJZ2Y6B6YFCMQZTGC

not attested not anchored not stored refs pending

Longest segment of balanced parentheses -- an exercise in program inversion in a segment problem (Functional Pearl)

Shin-Cheng Mu, Tsung-Ju Chiang

arxiv:2101.09699 v2 · 2021-01-24 · cs.PL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UIX2LV44SXJZ2Y6B6YFCMQZTGC}

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	2026-07-05T07:18:21.768613Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a22fa5d79c95d39d63c1f60a264333309e6dacccf61519599ea36bae7a0af1c2

Aliases

arxiv: 2101.09699 · arxiv_version: 2101.09699v2 · doi: 10.48550/arxiv.2101.09699 · pith_short_12: UIX2LV44SXJZ · pith_short_16: UIX2LV44SXJZ2Y6B · pith_short_8: UIX2LV44

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/UIX2LV44SXJZ2Y6B6YFCMQZTGC \
  | 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: a22fa5d79c95d39d63c1f60a264333309e6dacccf61519599ea36bae7a0af1c2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a6c73a7f2040ed3947d50b3f52da6a49c5867108cd6972c3c317ee6165bdb1d6",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-sa/4.0/",
    "primary_cat": "cs.PL",
    "submitted_at": "2021-01-24T12:20:27Z",
    "title_canon_sha256": "489b2bed803056986d7427f119ec18092af31e7a0446114278e532508accee12"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2101.09699",
    "kind": "arxiv",
    "version": 2
  }
}