Pith Number

pith:4MMB4OKV

pith:2009:4MMB4OKVRKQBAMJ3LRY4IUSQON

not attested not anchored not stored refs pending

Did Fomalhaut, HR 8799, and HL Tauri Form Planets via the Gravitational Instability? Placing Limits on the Required Disk Masses

D. Nero, J. E. Bjorkman

arxiv:0908.1108 v1 · 2009-08-07 · astro-ph.SR · astro-ph.EP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4MMB4OKVRKQBAMJ3LRY4IUSQON}

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	2026-05-18T02:12:36.553066Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e3181e39558aa010313b5c71c452507367979aa1a8dfe5beebd3c30115245b8e

Aliases

arxiv: 0908.1108 · arxiv_version: 0908.1108v1 · doi: 10.48550/arxiv.0908.1108 · pith_short_12: 4MMB4OKVRKQB · pith_short_16: 4MMB4OKVRKQBAMJ3 · pith_short_8: 4MMB4OKV

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/4MMB4OKVRKQBAMJ3LRY4IUSQON \
  | 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: e3181e39558aa010313b5c71c452507367979aa1a8dfe5beebd3c30115245b8e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "473d0ae258565932726c1b3c9f09ecbb6319e70c52955ec4355a2eb554dbfe78",
    "cross_cats_sorted": [
      "astro-ph.EP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2009-08-07T20:00:02Z",
    "title_canon_sha256": "ef2c17025af45c98e9258d7533fbe116b606837d9f3b602a1cf09016718cc2c1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0908.1108",
    "kind": "arxiv",
    "version": 1
  }
}