Pith Number

pith:73MHZZ4Y

pith:2019:73MHZZ4YKLFZ4ECBJBE7AWGQ2E

not attested not anchored not stored refs pending

Expanding the Timeline for Earth's Photosynthetic Red Edge Biosignature

Jack T. O'Malley-James, Lisa Kaltenegger

arxiv:1907.05245 v1 · 2019-07-10 · 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{73MHZZ4YKLFZ4ECBJBE7AWGQ2E}

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	2026-05-17T23:40:51.044065Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fed87ce79852cb9e10414849f058d0d1224166494aff68a854697d596702d74f

Aliases

arxiv: 1907.05245 · arxiv_version: 1907.05245v1 · doi: 10.48550/arxiv.1907.05245 · pith_short_12: 73MHZZ4YKLFZ · pith_short_16: 73MHZZ4YKLFZ4ECB · pith_short_8: 73MHZZ4Y

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/73MHZZ4YKLFZ4ECBJBE7AWGQ2E \
  | 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: fed87ce79852cb9e10414849f058d0d1224166494aff68a854697d596702d74f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ed67f83a701564107aa3983eace63fae3c90492ad35b5de7c760e10dc3746272",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2019-07-10T12:02:54Z",
    "title_canon_sha256": "20b99ce5416106b529e648f3b71f0874ea4c63484a01d1c52413dfdb707eac13"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1907.05245",
    "kind": "arxiv",
    "version": 1
  }
}