Pith Number

pith:LPMSDZQD

pith:2021:LPMSDZQDDOWSPJOBXF5OBMPN5E

not attested not anchored not stored refs pending

A greedy algorithm for dropping digits (Functional Pearl)

Richard Bird, Shin-Cheng Mu

arxiv:2101.09700 v1 · 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{LPMSDZQDDOWSPJOBXF5OBMPN5E}

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	2026-07-05T07:18:21.792854Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5bd921e6031bad27a5c1b97ae0b1ede9139b49b4b2b3537ece37de028fc84901

Aliases

arxiv: 2101.09700 · arxiv_version: 2101.09700v1 · doi: 10.48550/arxiv.2101.09700 · pith_short_12: LPMSDZQDDOWS · pith_short_16: LPMSDZQDDOWSPJOB · pith_short_8: LPMSDZQD

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/LPMSDZQDDOWSPJOBXF5OBMPN5E \
  | 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: 5bd921e6031bad27a5c1b97ae0b1ede9139b49b4b2b3537ece37de028fc84901

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3be3902ec2de33d9ed3fc8d1e74d12d5b427e922083af9f10a6a8f37dbcf92ad",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-sa/4.0/",
    "primary_cat": "cs.PL",
    "submitted_at": "2021-01-24T12:20:59Z",
    "title_canon_sha256": "e151f2097b483adf9d0a6690a938c1fb9dca5ef883f5213448a9cc5a0d27972a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2101.09700",
    "kind": "arxiv",
    "version": 1
  }
}