Pith Number

pith:UJQL2RGG

pith:2009:UJQL2RGGZC7SAK4U7QXSUR3TKG

not attested not anchored not stored refs pending

Some Subtle Concepts in Fundamental Physics

Ying-Qiu Gu

arxiv:0901.0309 v2 · 2009-01-05 · physics.gen-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{UJQL2RGGZC7SAK4U7QXSUR3TKG}

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	2026-05-18T00:34:32.190662Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a260bd44c6c8bf202b94fc2f2a477351bf0974ac64052571e3fd0f0e383684cf

Aliases

arxiv: 0901.0309 · arxiv_version: 0901.0309v2 · doi: 10.48550/arxiv.0901.0309 · pith_short_12: UJQL2RGGZC7S · pith_short_16: UJQL2RGGZC7SAK4U · pith_short_8: UJQL2RGG

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/UJQL2RGGZC7SAK4U7QXSUR3TKG \
  | 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: a260bd44c6c8bf202b94fc2f2a477351bf0974ac64052571e3fd0f0e383684cf

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "449c90757ffaf151495600b7c5c3aa0b58daed5e7c8b67f7477bcc10b97095ab",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.gen-ph",
    "submitted_at": "2009-01-05T03:01:19Z",
    "title_canon_sha256": "5c436af8440c7b39d07f100fc96789dde7ab74ffdc20f2e1174a3214d6cbdaac"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0901.0309",
    "kind": "arxiv",
    "version": 2
  }
}