Pith Number

pith:MQT7HL7N

pith:2016:MQT7HL7NYSAY3QWUGPBIBX2HSY

not attested not anchored not stored refs pending

H, He-like recombination spectra I: $l$-changing collisions for hydrogen

F. Guzm\'an, G.J. Ferland, M. Chatzikos, N.R. Badnell, P. A. M. van Hoof, R.J.R. Williams

arxiv:1604.03978 v1 · 2016-04-13 · astro-ph.GA · astro-ph.CO · astro-ph.SR · physics.atom-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{MQT7HL7NYSAY3QWUGPBIBX2HSY}

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	2026-05-18T01:16:12.783397Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6427f3afedc4818dc2d433c280df479607fa06374f0e0be9435da14d7c382d87

Aliases

arxiv: 1604.03978 · arxiv_version: 1604.03978v1 · doi: 10.48550/arxiv.1604.03978 · pith_short_12: MQT7HL7NYSAY · pith_short_16: MQT7HL7NYSAY3QWU · pith_short_8: MQT7HL7N

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/MQT7HL7NYSAY3QWUGPBIBX2HSY \
  | 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: 6427f3afedc4818dc2d433c280df479607fa06374f0e0be9435da14d7c382d87

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1ce2f5c285a7aeb70ff1967ea0a7bcc1ce4ceed4c73689914c675e3bb19b8863",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "astro-ph.SR",
      "physics.atom-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2016-04-13T21:28:16Z",
    "title_canon_sha256": "2c0d735e5bcd30b6f89355d0d202841c793b832c65e078de19f26440c33e2b8f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1604.03978",
    "kind": "arxiv",
    "version": 1
  }
}