Pith Number

pith:UBBQTDDG

pith:2017:UBBQTDDGWHMHGPGF4JRG55QJQE

not attested not anchored not stored refs pending

Equivalence relations on ecosystems

Matthew Spencer

arxiv:1707.03302 v1 · 2017-07-11 · q-bio.PE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UBBQTDDGWHMHGPGF4JRG55QJQE}

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	2026-05-18T00:40:29.378540Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a043098c66b1d8733cc5e2626ef609813582e7410337b1ecab9b3eb8bbd70283

Aliases

arxiv: 1707.03302 · arxiv_version: 1707.03302v1 · doi: 10.48550/arxiv.1707.03302 · pith_short_12: UBBQTDDGWHMH · pith_short_16: UBBQTDDGWHMHGPGF · pith_short_8: UBBQTDDG

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/UBBQTDDGWHMHGPGF4JRG55QJQE \
  | 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: a043098c66b1d8733cc5e2626ef609813582e7410337b1ecab9b3eb8bbd70283

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a2243779018373629d950794b213f4d1f3100be561d2d0573a8c7f0c90998a00",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "q-bio.PE",
    "submitted_at": "2017-07-11T14:30:54Z",
    "title_canon_sha256": "52b43a0df4e40ccf45edfd9e786fe7068b0b86a1c1b7a981d5d12199cab99bde"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1707.03302",
    "kind": "arxiv",
    "version": 1
  }
}