Pith Number

pith:4I3YKMNK

pith:2012:4I3YKMNKX6FCHKEM7EBMVMDWWK

not attested not anchored not stored refs pending

Quantum Metrological Limits via a Variational Approach

B. M. Escher, L. Davidovich, N. Zagury, R. L. de Matos Filho

arxiv:1207.3307 v2 · 2012-07-13 · 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{4I3YKMNKX6FCHKEM7EBMVMDWWK}

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	2026-05-18T03:40:25.477340Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e2378531aabf8a23a88cf902cab076b286dac2dd0c00ad5fafd5043e64b5fb69

Aliases

arxiv: 1207.3307 · arxiv_version: 1207.3307v2 · doi: 10.48550/arxiv.1207.3307 · pith_short_12: 4I3YKMNKX6FC · pith_short_16: 4I3YKMNKX6FCHKEM · pith_short_8: 4I3YKMNK

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/4I3YKMNKX6FCHKEM7EBMVMDWWK \
  | 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: e2378531aabf8a23a88cf902cab076b286dac2dd0c00ad5fafd5043e64b5fb69

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "63d3944e8ff755767e4175b1d09b8e0f0ee90c4fdb27e2e0871313fc128fc9aa",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2012-07-13T17:11:21Z",
    "title_canon_sha256": "417a94b97573e145aabeee161a77c3fabc11028e16cc81372412ea717307f610"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1207.3307",
    "kind": "arxiv",
    "version": 2
  }
}