Pith Number

pith:2BBMLB74

pith:2018:2BBMLB74N76XMNRVICHOJDFT4C

not attested not anchored not stored refs pending

The Second Nucleus of NGC 7727: Direct Evidence for the Formation and Evolution of an Ultracompact Dwarf Galaxy

(2) University of Michigan, (3) Space Telescope Science Institute), Bradley C. Whitmore (3), Daniel D. Kelson (1), Edward V. Villanueva (1) ((1) Carnegie Observatories, Francois Schweizer (1), Patrick Seitzer (2)

arxiv:1801.07254 v1 · 2018-01-22 · astro-ph.GA · astro-ph.CO · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2BBMLB74N76XMNRVICHOJDFT4C}

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	2026-05-17T23:47:49.120434Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d042c587fc6ffd763635408ee48cb3e0b5238e55726f885b4539b2da5206704c

Aliases

arxiv: 1801.07254 · arxiv_version: 1801.07254v1 · doi: 10.48550/arxiv.1801.07254 · pith_short_12: 2BBMLB74N76X · pith_short_16: 2BBMLB74N76XMNRV · pith_short_8: 2BBMLB74

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/2BBMLB74N76XMNRVICHOJDFT4C \
  | 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: d042c587fc6ffd763635408ee48cb3e0b5238e55726f885b4539b2da5206704c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e75c1dc9c98698bfa13cc0ff34037959014559d11ffa7733a4e5e91c9d530cae",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2018-01-22T19:00:01Z",
    "title_canon_sha256": "c934cd5c9e069734bdb476a33b21b31775827a1948257d8a920b56e31e8ef434"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1801.07254",
    "kind": "arxiv",
    "version": 1
  }
}