Pith Number

pith:7OL3KXXD

pith:2016:7OL3KXXDZKTIAEP4HHPFJ7YLK4

not attested not anchored not stored refs pending

Is the tautochrone curve unique?

C. Farina, Pedro Terra, Reinaldo de Melo e Souza

arxiv:1610.01006 v1 · 2016-10-01 · 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{7OL3KXXDZKTIAEP4HHPFJ7YLK4}

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	2026-05-18T00:57:25.694382Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fb97b55ee3caa68011fc39de54ff0b57197f35068f235db85c7acb2c2c45c79e

Aliases

arxiv: 1610.01006 · arxiv_version: 1610.01006v1 · doi: 10.48550/arxiv.1610.01006 · pith_short_12: 7OL3KXXDZKTI · pith_short_16: 7OL3KXXDZKTIAEP4 · pith_short_8: 7OL3KXXD

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/7OL3KXXDZKTIAEP4HHPFJ7YLK4 \
  | 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: fb97b55ee3caa68011fc39de54ff0b57197f35068f235db85c7acb2c2c45c79e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "65f221bb1b0858a4f4033af6ce2872a8a0b9c9e13ee96a537d30b1657f28c964",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.class-ph",
    "submitted_at": "2016-10-01T03:29:34Z",
    "title_canon_sha256": "d861f0b6c84b8276eb0d960b55c169f0640a7829153336b30d65dd6f8fd0c092"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1610.01006",
    "kind": "arxiv",
    "version": 1
  }
}