Pith Number

pith:TIP72PRF

pith:2018:TIP72PRFL5XKFOQXJTUYT5FZQO

not attested not anchored not stored refs pending

Which NP-Hard SAT and CSP Problems Admit Exponentially Improved Algorithms?

Magnus Wahlstr\"om, Victor Lagerkvist

arxiv:1801.09488 v1 · 2018-01-29 · cs.DS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{TIP72PRFL5XKFOQXJTUYT5FZQO}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more

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	2026-05-18T00:24:57.282864Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9a1ffd3e255f6ea2ba174ce989f4b98398afc72fab15189021879b5648973b99

Aliases

arxiv: 1801.09488 · arxiv_version: 1801.09488v1 · doi: 10.48550/arxiv.1801.09488 · pith_short_12: TIP72PRFL5XK · pith_short_16: TIP72PRFL5XKFOQX · pith_short_8: TIP72PRF

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/TIP72PRFL5XKFOQXJTUYT5FZQO \
  | 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: 9a1ffd3e255f6ea2ba174ce989f4b98398afc72fab15189021879b5648973b99

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "154339098ce85008a63ad5f8a353278ae749b590dda22668e11cbc5d727fc889",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2018-01-29T13:06:44Z",
    "title_canon_sha256": "a6260e727aa4903cc24ca3850acf0530f75962a940fa7c91cf7d00d265a971c4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1801.09488",
    "kind": "arxiv",
    "version": 1
  }
}