Pith Number

pith:OEIYDFFN

pith:2009:OEIYDFFNJAOWUQREPLTLPROWE2

not attested not anchored not stored refs pending

Using the Sound Card as a Timer

Carlos Eduardo Aguiar, Marta Maximo Pereira

arxiv:0908.1437 v1 · 2009-08-11 · physics.pop-ph · physics.class-ph · physics.ed-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{OEIYDFFNJAOWUQREPLTLPROWE2}

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	2026-05-18T03:20:57.443562Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

71118194ad481d6a42247ae6b7c5d6269a568da6e969a04c6870063d919f629a

Aliases

arxiv: 0908.1437 · arxiv_version: 0908.1437v1 · doi: 10.48550/arxiv.0908.1437 · pith_short_12: OEIYDFFNJAOW · pith_short_16: OEIYDFFNJAOWUQRE · pith_short_8: OEIYDFFN

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/OEIYDFFNJAOWUQREPLTLPROWE2 \
  | 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: 71118194ad481d6a42247ae6b7c5d6269a568da6e969a04c6870063d919f629a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fb46f6b499d01f25d37a2958ad2f92988a478a36e4730174ac4f56742507658c",
    "cross_cats_sorted": [
      "physics.class-ph",
      "physics.ed-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.pop-ph",
    "submitted_at": "2009-08-11T02:29:37Z",
    "title_canon_sha256": "f763905ca53052d11b9ee7d724db7b4a604172e515442676ba70f9a8ca127705"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0908.1437",
    "kind": "arxiv",
    "version": 1
  }
}