Pith Number

pith:JQFH6SPE

pith:2019:JQFH6SPEINDLY5KY3N4WGKUEDC

not attested not anchored not stored refs pending

The temporal requirements of directly observing self-gravitating spiral waves in protoplanetary discs with ALMA

Cassandra Hall, Joan Najita, Ken Rice, Richard Alexander, Ruobing Dong, Sean Brittain, Tim J. Harries

arxiv:1901.02407 v3 · 2019-01-08 · astro-ph.EP · astro-ph.SR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{JQFH6SPEINDLY5KY3N4WGKUEDC}

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	2026-05-17T23:43:50.148537Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4c0a7f49e44346bc7558db79632a84189b07ce864831b601d71643989d506256

Aliases

arxiv: 1901.02407 · arxiv_version: 1901.02407v3 · doi: 10.48550/arxiv.1901.02407 · pith_short_12: JQFH6SPEINDL · pith_short_16: JQFH6SPEINDLY5KY · pith_short_8: JQFH6SPE

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/JQFH6SPEINDLY5KY3N4WGKUEDC \
  | 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: 4c0a7f49e44346bc7558db79632a84189b07ce864831b601d71643989d506256

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "02d33faa7fbb3fab52d6c99d18f11ee40956e7990f1693f91e336935663ab50c",
    "cross_cats_sorted": [
      "astro-ph.SR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2019-01-08T17:07:34Z",
    "title_canon_sha256": "7d7454961cd9d83d9d2d70c2d1009b9ee3da5c5c108feaecf9ef72cd05c8fed7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1901.02407",
    "kind": "arxiv",
    "version": 3
  }
}