Pith Number

pith:KFHTP7DC

pith:2021:KFHTP7DCM4FCOSD7CXSSJ7I5BK

not attested not anchored not stored refs pending

Gravitational Redshift Tests with Atomic Clocks and Atom Interferometers

Alexander Friedrich, Christian Ufrecht, Enno Giese, Fabio Di Pumpo, William G. Unruh, Wolfgang P. Schleich

arxiv:2104.14391 v2 · 2021-04-29 · quant-ph · gr-qc · physics.atom-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{KFHTP7DCM4FCOSD7CXSSJ7I5BK}

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	2026-07-05T03:32:52.792840Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

514f37fc62670a27487f15e524fd1d0a8306c7e9984b8f4bd78b276896722903

Aliases

arxiv: 2104.14391 · arxiv_version: 2104.14391v2 · doi: 10.48550/arxiv.2104.14391 · pith_short_12: KFHTP7DCM4FC · pith_short_16: KFHTP7DCM4FCOSD7 · pith_short_8: KFHTP7DC

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/KFHTP7DCM4FCOSD7CXSSJ7I5BK \
  | 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: 514f37fc62670a27487f15e524fd1d0a8306c7e9984b8f4bd78b276896722903

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fbdb9e2e4d2ac8ea44b947b51283446e3b60cd8c09b187b107842529ede1ec31",
    "cross_cats_sorted": [
      "gr-qc",
      "physics.atom-ph"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2021-04-29T15:07:40Z",
    "title_canon_sha256": "7d709744898243d440d1ffb91865455440ab3ecbf700667374026117e67396c4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2104.14391",
    "kind": "arxiv",
    "version": 2
  }
}