Pith Number

pith:UPALMQFC

pith:2015:UPALMQFCQB4VYMHGH3CXDBSSM5

not attested not anchored not stored refs pending

Extragalactic SETI: The Tully-Fisher relation as a probe of Dysonian astroengineering in disk galaxies

A. Nyholm, E. Zackrisson, P. Calissendorff, S. Asadi

arxiv:1508.02406 v2 · 2015-08-10 · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UPALMQFCQB4VYMHGH3CXDBSSM5}

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	2026-05-18T01:33:41.845949Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a3c0b640a280795c30e63ec57186526753d9eef2a40154c851b2edc28cbd7a81

Aliases

arxiv: 1508.02406 · arxiv_version: 1508.02406v2 · doi: 10.48550/arxiv.1508.02406 · pith_short_12: UPALMQFCQB4V · pith_short_16: UPALMQFCQB4VYMHG · pith_short_8: UPALMQFC

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/UPALMQFCQB4VYMHGH3CXDBSSM5 \
  | 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: a3c0b640a280795c30e63ec57186526753d9eef2a40154c851b2edc28cbd7a81

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "abdf7d5dc99d7a42969e687d359542fbf6972a6d5afd4cad67d1e991408fcd43",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2015-08-10T20:10:13Z",
    "title_canon_sha256": "d6bd70c33efe1ab254bdd39569c22a8c10c1b0d9f67c8b65de907755ffeadc5a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1508.02406",
    "kind": "arxiv",
    "version": 2
  }
}