Pith Number

pith:XTFYXDQ6

pith:2026:XTFYXDQ6RQYQ6QQVISAS2V4WFZ

not attested not anchored not stored refs pending

DeFAb: A Verifiable Benchmark for Defeasible Abduction in Foundation Models

Alvaro Velasquez, Patrick Cooper

arxiv:2606.18557 v1 · 2026-06-17 · cs.AI · cs.LG · 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{XTFYXDQ6RQYQ6QQVISAS2V4WFZ}

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	2026-06-19T16:11:40.865116Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bccb8b8e1e8c310f421544812d57962e47dff5685edf4b09db0c707c6efcf32c

Aliases

arxiv: 2606.18557 · arxiv_version: 2606.18557v1 · doi: 10.48550/arxiv.2606.18557 · pith_short_12: XTFYXDQ6RQYQ · pith_short_16: XTFYXDQ6RQYQ6QQV · pith_short_8: XTFYXDQ6

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/XTFYXDQ6RQYQ6QQVISAS2V4WFZ \
  | 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: bccb8b8e1e8c310f421544812d57962e47dff5685edf4b09db0c707c6efcf32c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f78a39e5cc64fd3751a8a1fd68af05f76bd55557ea52a67ae1ec7a10f90ab335",
    "cross_cats_sorted": [
      "cs.LG",
      "cs.LO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.AI",
    "submitted_at": "2026-06-17T00:13:40Z",
    "title_canon_sha256": "0c42088246af853c6af3eb356b11dfb05ef39484b2f123984454b5c091f89325"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2606.18557",
    "kind": "arxiv",
    "version": 1
  }
}