Pith Number

pith:MDSOCWQF

pith:2026:MDSOCWQFZKGL6X4RZYZDSUGV3N

not attested not anchored not stored refs pending

Solver-Hard Is Not Model-Hard: A Hardness-Controlled Diagnostic for LLM Constraint Reasoning

Lucky Verma

arxiv:2607.17047 v1 · 2026-07-19 · cs.LG · cs.AI · cs.LO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{MDSOCWQFZKGL6X4RZYZDSUGV3N}

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	2026-07-21T01:21:12.135444Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

60e4e15a05ca8cbf5f91ce323950d5db74ea0819937cb4c2e96bcd03a83a501e

Aliases

arxiv: 2607.17047 · arxiv_version: 2607.17047v1 · doi: 10.48550/arxiv.2607.17047 · pith_short_12: MDSOCWQFZKGL · pith_short_16: MDSOCWQFZKGL6X4R · pith_short_8: MDSOCWQF

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/MDSOCWQFZKGL6X4RZYZDSUGV3N \
  | 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: 60e4e15a05ca8cbf5f91ce323950d5db74ea0819937cb4c2e96bcd03a83a501e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "df28038b7e3f67896271753489ea30d1e25a9fcb1a99ca688f46d8ad72e3bad5",
    "cross_cats_sorted": [
      "cs.AI",
      "cs.LO"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2026-07-19T03:23:22Z",
    "title_canon_sha256": "d187cd1e839714a7617d02e98d832886281b1c683aed8cdbba3a84127d6d69de"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2607.17047",
    "kind": "arxiv",
    "version": 1
  }
}