Pith Number

pith:2QYFBTS5

pith:2013:2QYFBTS54ZM4Z2RJIHRUPXLHOV

not attested not anchored not stored refs pending

Chromospheric activity as age indicator

Giancarlo Pace (CAUP, Portugal)

arxiv:1301.5651 v3 · 2013-01-23 · astro-ph.SR

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2QYFBTS54ZM4Z2RJIHRUPXLHOV}

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	2026-05-18T00:49:19.634213Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d43050ce5de659ccea2941e347dd6775482938b3b3ff4a910f6bf6efa0844b01

Aliases

arxiv: 1301.5651 · arxiv_version: 1301.5651v3 · doi: 10.48550/arxiv.1301.5651 · pith_short_12: 2QYFBTS54ZM4 · pith_short_16: 2QYFBTS54ZM4Z2RJ · pith_short_8: 2QYFBTS5

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/2QYFBTS54ZM4Z2RJIHRUPXLHOV \
  | 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: d43050ce5de659ccea2941e347dd6775482938b3b3ff4a910f6bf6efa0844b01

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ea8b0b4686fefdbab5ed19424615500f21f71a221fd8032a68d9734505187f31",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2013-01-23T21:21:10Z",
    "title_canon_sha256": "18422eba0964cca6e1d982379150f07cf3394ae617e652ba79e83e3a8632e647"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1301.5651",
    "kind": "arxiv",
    "version": 3
  }
}