Pith Number

pith:S7WOZ5WE

pith:2019:S7WOZ5WEV4KPQSOL7PVPS5Q2RA

not attested not anchored not stored refs pending

A strong no-go theorem on the Wigner's friend paradox

An\'ibal Utreras-Alarc\'on, Eric G. Cavalcanti, Farzad Ghafari, Geoff J. Pryde, Howard M. Wiseman, Kok-Wei Bong, Nora Tischler, Yeong-Cherng Liang

arxiv:1907.05607 v4 · 2019-07-12 · 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{S7WOZ5WEV4KPQSOL7PVPS5Q2RA}

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	2026-07-05T05:51:22.973406Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

97ececf6c4af14f849cbfbeaf9761a883b6688115c7fc7059ea8329c07b2037e

Aliases

arxiv: 1907.05607 · arxiv_version: 1907.05607v4 · doi: 10.48550/arxiv.1907.05607 · pith_short_12: S7WOZ5WEV4KP · pith_short_16: S7WOZ5WEV4KPQSOL · pith_short_8: S7WOZ5WE

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/S7WOZ5WEV4KPQSOL7PVPS5Q2RA \
  | 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: 97ececf6c4af14f849cbfbeaf9761a883b6688115c7fc7059ea8329c07b2037e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "842460801f4dd97dca9ed77733f04a9a50e027fa046cc22fabfdb459b9005596",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2019-07-12T08:09:44Z",
    "title_canon_sha256": "e9cbfec5ebc47033f747ada3b7cc4edf3334786d62a0d6094c512d45c81796d5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1907.05607",
    "kind": "arxiv",
    "version": 4
  }
}