Pith Number

pith:YX47ARC5

pith:2011:YX47ARC5VNNUVXQX4C54JMVBVI

not attested not anchored not stored refs pending

Echo-based measurement of the speed of sound

Alivia Berg, Michael Courtney

arxiv:1102.2664 v1 · 2011-02-14 · physics.pop-ph · physics.class-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{YX47ARC5VNNUVXQX4C54JMVBVI}

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	2026-05-18T04:28:46.783360Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c5f9f0445dab5b4ade17e0bbc4b2a1aa2afa9d4c63791cd9d1c53e11dc81b242

Aliases

arxiv: 1102.2664 · arxiv_version: 1102.2664v1 · doi: 10.48550/arxiv.1102.2664 · pith_short_12: YX47ARC5VNNU · pith_short_16: YX47ARC5VNNUVXQX · pith_short_8: YX47ARC5

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/YX47ARC5VNNUVXQX4C54JMVBVI \
  | 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: c5f9f0445dab5b4ade17e0bbc4b2a1aa2afa9d4c63791cd9d1c53e11dc81b242

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ba7b1577a142bc75ff1b6de3eea1e2814f11eb17914d5c2e8b99e31ce922c6a0",
    "cross_cats_sorted": [
      "physics.class-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.pop-ph",
    "submitted_at": "2011-02-14T02:33:18Z",
    "title_canon_sha256": "14a3af35d00c44052ea9ae2aed3a3063fff4e5fa2e0a7158ac4e3bd77de73094"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1102.2664",
    "kind": "arxiv",
    "version": 1
  }
}