Pith Number

pith:VDXBVAFE

pith:2019:VDXBVAFEHP4IKYPX4ZDABW7EZE

not attested not anchored not stored refs pending

The umbral--penumbral boundary in sunspsots in the context of magneto-convection

D. J. Mullan, J. MacDonald

arxiv:1902.09431 v1 · 2019-02-25 · 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{VDXBVAFEHP4IKYPX4ZDABW7EZE}

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	2026-05-17T23:50:55.480281Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a8ee1a80a43bf88561f7e64600dbe4c93662c75e55bf9f31a8882e035d07d4b4

Aliases

arxiv: 1902.09431 · arxiv_version: 1902.09431v1 · doi: 10.48550/arxiv.1902.09431 · pith_short_12: VDXBVAFEHP4I · pith_short_16: VDXBVAFEHP4IKYPX · pith_short_8: VDXBVAFE

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/VDXBVAFEHP4IKYPX4ZDABW7EZE \
  | 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: a8ee1a80a43bf88561f7e64600dbe4c93662c75e55bf9f31a8882e035d07d4b4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c0387ad645a359bdd2e449afe5d9d2645ce3d908c7f7971dc31e7c08ff6eab18",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2019-02-25T16:48:02Z",
    "title_canon_sha256": "ced88888823e1bec8912077b11347dffb6504d11fba664b75aaf3a0b2328fdea"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.09431",
    "kind": "arxiv",
    "version": 1
  }
}