Pith Number

pith:NJ57OLM6

pith:2021:NJ57OLM6QZ5T2Z57F4SLH7OFEX

not attested not anchored not stored refs pending

Spatially Resolved Stellar Spectroscopy of the Ultra-diffuse Galaxy Dragonfly 44. III. Evidence for an Unexpected Star-Formation History

Aaron J. Romanowsky, Alexa Villaume, Charlie Conroy, Christopher Martin, Duncan Forbes, Jean Brodie, Matt Matuszewski, Pieter van Dokkum, Shany Danieli

arxiv:2101.02220 v2 · 2021-01-06 · 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{NJ57OLM6QZ5T2Z57F4SLH7OFEX}

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	2026-07-05T03:49:08.217286Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6a7bf72d9e867b3d67bf2f24b3fdc525c007011ce8b7fa95587f32d2c062df28

Aliases

arxiv: 2101.02220 · arxiv_version: 2101.02220v2 · doi: 10.48550/arxiv.2101.02220 · pith_short_12: NJ57OLM6QZ5T · pith_short_16: NJ57OLM6QZ5T2Z57 · pith_short_8: NJ57OLM6

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/NJ57OLM6QZ5T2Z57F4SLH7OFEX \
  | 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: 6a7bf72d9e867b3d67bf2f24b3fdc525c007011ce8b7fa95587f32d2c062df28

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cf0881055f377d2602341df92b7bb3f9932943acea5d82179112bad5e1827814",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2021-01-06T19:00:05Z",
    "title_canon_sha256": "1eb5e875cea246b363ea9692b79a0dffe5220484ac724c5ed908e739e144ce88"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2101.02220",
    "kind": "arxiv",
    "version": 2
  }
}