Pith Number

pith:TUWOMZFC

pith:2014:TUWOMZFCOSAVUEG4ADOLABJURQ

not attested not anchored not stored refs pending

Resolution of the Surprise Exam Paradox

Tahl Nowik

arxiv:1412.0955 v1 · 2014-12-02 · math.HO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{TUWOMZFCOSAVUEG4ADOLABJURQ}

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	2026-05-18T02:32:15.280093Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9d2ce664a274815a10dc00dcb005348c3bea2c749ddd65ce2a6bb9ec52026f68

Aliases

arxiv: 1412.0955 · arxiv_version: 1412.0955v1 · doi: 10.48550/arxiv.1412.0955 · pith_short_12: TUWOMZFCOSAV · pith_short_16: TUWOMZFCOSAVUEG4 · pith_short_8: TUWOMZFC

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/TUWOMZFCOSAVUEG4ADOLABJURQ \
  | 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: 9d2ce664a274815a10dc00dcb005348c3bea2c749ddd65ce2a6bb9ec52026f68

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d2461558e87c0d1c251a0bc142feda6774d68624d1350afebf97149fc9e11d8f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.HO",
    "submitted_at": "2014-12-02T16:13:02Z",
    "title_canon_sha256": "fb1a404e1a0f60a584d58658aa90a398868ed76a0240a00943707e6e58698265"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1412.0955",
    "kind": "arxiv",
    "version": 1
  }
}