Pith Number

pith:WKTR27OP

pith:2018:WKTR27OPQHRZSL5KUJCAWZVLP5

not attested not anchored not stored refs pending

When Greenberger, Horne and Zeilinger meet Wigner's Friend

Gijs Leegwater

arxiv:1811.02442 v2 · 2018-11-06 · quant-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{WKTR27OPQHRZSL5KUJCAWZVLP5}

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.

Cited by

1 paper in Pith

What Do Black Holes Teach Us About Wigner's Friend?

Receipt and verification

First computed	2026-05-18T00:01:21.344905Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b2a71d7dcf81e3992faaa2440b66ab7f410021c5fb5547bd130a481188d7841b

Aliases

arxiv: 1811.02442 · arxiv_version: 1811.02442v2 · doi: 10.48550/arxiv.1811.02442 · pith_short_12: WKTR27OPQHRZ · pith_short_16: WKTR27OPQHRZSL5K · pith_short_8: WKTR27OP

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/WKTR27OPQHRZSL5KUJCAWZVLP5 \
  | 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: b2a71d7dcf81e3992faaa2440b66ab7f410021c5fb5547bd130a481188d7841b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1f2f9f1361e310dfab23ba76a1bf7357757e2695bdee91a4de4668c74b650a53",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2018-11-06T15:46:02Z",
    "title_canon_sha256": "fbb32e677acb06188761a0ce4fdb8a791c4526a505c57416e2671f0b5336d3df"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1811.02442",
    "kind": "arxiv",
    "version": 2
  }
}