Pith Number

pith:SMPBKQMD

pith:2020:SMPBKQMD5MDUGCTSNQIRFXGJLB

not attested not anchored not stored refs pending

Information Hiding Using Matroid Theory

Olga Kuznetsova, Ragnar Freij-Hollanti

arxiv:2009.02991 v2 · 2020-09-07 · math.CO · cs.IT · math.IT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SMPBKQMD5MDUGCTSNQIRFXGJLB}

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	2026-07-05T02:41:28.595768Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

931e154183eb07430a726c1112dcc9584bea54f13fe6d7640ae2523aa47dae74

Aliases

arxiv: 2009.02991 · arxiv_version: 2009.02991v2 · doi: 10.48550/arxiv.2009.02991 · pith_short_12: SMPBKQMD5MDU · pith_short_16: SMPBKQMD5MDUGCTS · pith_short_8: SMPBKQMD

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/SMPBKQMD5MDUGCTSNQIRFXGJLB \
  | 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: 931e154183eb07430a726c1112dcc9584bea54f13fe6d7640ae2523aa47dae74

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6057fdb88902b4ed84cc13cd523904914c070748c5f8e8ccf4fbc4b1ae9e3ae1",
    "cross_cats_sorted": [
      "cs.IT",
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2020-09-07T10:17:43Z",
    "title_canon_sha256": "684e61430c858675fddbf24bbc9587b3d04e571fcfe140b483e9c71eb3047bb6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2009.02991",
    "kind": "arxiv",
    "version": 2
  }
}