Pith Number

pith:ZVZOTO5B

pith:2025:ZVZOTO5BOJJTCACTIZLXUUTGNF

not attested not anchored not stored refs pending

Hydrogen 21 cm Constraints on the Photon's Spin Scale

Aidan Reilly, Alessandro Russo, Natalia Toro, Philip Schuster

arxiv:2505.15890 v2 · 2025-05-21 · hep-ph · 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{ZVZOTO5BOJJTCACTIZLXUUTGNF}

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	2026-07-05T11:33:23.951541Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cd72e9bba1725331005346577a5266694d458fdcfcc33fef7c80c87ab48e4ade

Aliases

arxiv: 2505.15890 · arxiv_version: 2505.15890v2 · doi: 10.48550/arxiv.2505.15890 · pith_short_12: ZVZOTO5BOJJT · pith_short_16: ZVZOTO5BOJJTCACT · pith_short_8: ZVZOTO5B

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/ZVZOTO5BOJJTCACTIZLXUUTGNF \
  | 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: cd72e9bba1725331005346577a5266694d458fdcfcc33fef7c80c87ab48e4ade

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6bdb4571ca838e5b8961f92d3dfd80ea4c2c707d3570717c47dbb3987ce0b887",
    "cross_cats_sorted": [
      "physics.atom-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "hep-ph",
    "submitted_at": "2025-05-21T18:00:00Z",
    "title_canon_sha256": "10b0cdbfdd4c5721388b456bff79e324fe128d031b69caf66e00c5cbb09801db"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2505.15890",
    "kind": "arxiv",
    "version": 2
  }
}