Pith Number

pith:VB5KJIYS

pith:2019:VB5KJIYSGFKR77EOSM5M4X3WKQ

not attested not anchored not stored refs pending

Lessons from early Earth: UV surface radiation should not limit the habitability of active M star systems

Jack T. O'Malley-James, Lisa Kaltenegger

arxiv:1904.03956 v1 · 2019-04-08 · 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{VB5KJIYSGFKR77EOSM5M4X3WKQ}

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	2026-05-17T23:48:29.438425Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a87aa4a31231551ffc8e933ace5f76543f44ae58b238777dd646fe81207987e2

Aliases

arxiv: 1904.03956 · arxiv_version: 1904.03956v1 · doi: 10.48550/arxiv.1904.03956 · pith_short_12: VB5KJIYSGFKR · pith_short_16: VB5KJIYSGFKR77EO · pith_short_8: VB5KJIYS

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/VB5KJIYSGFKR77EOSM5M4X3WKQ \
  | 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: a87aa4a31231551ffc8e933ace5f76543f44ae58b238777dd646fe81207987e2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "738ad764d6c7d9e633d2423d7dde10cfca9a7281c94a722a8abb0340deb90e33",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2019-04-08T11:15:22Z",
    "title_canon_sha256": "e54255f51fdedfabcea1d9d7e50d18b0a1b827b3e6becaebd0c0ff3fcef22e96"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1904.03956",
    "kind": "arxiv",
    "version": 1
  }
}